diff --git a/compiler/expressions.go b/compiler/expressions.go
index 42fe624b6..0553f9dcd 100644
--- a/compiler/expressions.go
+++ b/compiler/expressions.go
@@ -1213,8 +1213,6 @@ func (c *funcContext) internalize(s *expression, t types.Type) *expression {
 	switch u := t.Underlying().(type) {
 	case *types.Basic:
 		switch {
-		case isBoolean(u):
-			return c.formatExpr("!!(%s)", s)
 		case isInteger(u) && !is64Bit(u):
 			return c.fixNumber(c.formatExpr("$parseInt(%s)", s), u)
 		case isFloat(u):
diff --git a/compiler/prelude/jsmapping.go b/compiler/prelude/jsmapping.go
index dc29cba6b..da5bb901c 100644
--- a/compiler/prelude/jsmapping.go
+++ b/compiler/prelude/jsmapping.go
@@ -194,7 +194,13 @@ var $internalize = function(v, t, recv) {
   }
   switch (t.kind) {
   case $kindBool:
-    return !!v;
+    if (v === undefined || v == null) {
+      return false;
+    }
+    if (v.constructor !== Boolean) {
+      $throwRuntimeError("tried to internalize non-bool value of type " + $typeof(v));
+    }
+    return Boolean(v);
   case $kindInt:
     return parseInt(v);
   case $kindInt8:
@@ -253,12 +259,9 @@ var $internalize = function(v, t, recv) {
     if (t.methods.length !== 0) {
       $throwRuntimeError("cannot internalize " + t.string);
     }
-    if (v === null) {
+    if (v === null || v === undefined) {
       return $ifaceNil;
     }
-    if (v === undefined) {
-      return new $jsObjectPtr(undefined);
-    }
     switch (v.constructor) {
     case Int8Array:
       return new ($sliceType($Int8))(v);
@@ -315,6 +318,12 @@ var $internalize = function(v, t, recv) {
   case $kindSlice:
     return new t($mapArray(v, function(e) { return $internalize(e, t.elem); }));
   case $kindString:
+    if (v === undefined || v == null) {
+      return "";
+    }
+    if (v.constructor !== String) {
+      $throwRuntimeError("tried to internalize non-string value of type " + $typeof(v));
+    }
     v = String(v);
     if ($isASCII(v)) {
       return v;
@@ -367,6 +376,21 @@ var $internalize = function(v, t, recv) {
   $throwRuntimeError("cannot internalize " + t.string);
 };
 
+var $typeof = function(v) {
+  if (v === undefined) {
+    return "undefined";
+  }
+
+  if (v === null) {
+    return "null";
+  }
+
+  var to = typeof v;
+  var cn = v.constructor.name;
+
+  return to + "/" + cn;
+};
+
 /* $isASCII reports whether string s contains only ASCII characters. */
 var $isASCII = function(s) {
   for (var i = 0; i < s.length; i++) {
diff --git a/compiler/prelude/prelude_min.go b/compiler/prelude/prelude_min.go
index ed6fb09ba..9b9a3845d 100644
--- a/compiler/prelude/prelude_min.go
+++ b/compiler/prelude/prelude_min.go
@@ -3,4 +3,4 @@
 package prelude
 
 // Minified is an uglifyjs-minified version of Prelude.
-const Minified = "var $global,$module;if(Error.stackTraceLimit=1/0,\"undefined\"!=typeof window?$global=window:\"undefined\"!=typeof self?$global=self:\"undefined\"!=typeof global?($global=global).require=require:$global=this,void 0===$global||void 0===$global.Array)throw new Error(\"no global object found\");\"undefined\"!=typeof module&&($module=module);var $throwRuntimeError,$packages={},$idCounter=0,$keys=function(e){return e?Object.keys(e):[]},$flushConsole=function(){},$throwNilPointerError=function(){$throwRuntimeError(\"invalid memory address or nil pointer dereference\")},$call=function(e,n,r){return e.apply(n,r)},$makeFunc=function(e){return function(){return $externalize(e(this,new($sliceType($jsObjectPtr))($global.Array.prototype.slice.call(arguments,[]))),$emptyInterface)}},$unused=function(e){},$mapArray=function(e,n){for(var r=new e.constructor(e.length),t=0;t<e.length;t++)r[t]=n(e[t]);return r},$methodVal=function(e,n){var r=e.$methodVals||{};e.$methodVals=r;var t=r[n];if(void 0!==t)return t;var i=e[n];return t=function(){$stackDepthOffset--;try{return i.apply(e,arguments)}finally{$stackDepthOffset++}},r[n]=t,t},$methodExpr=function(e,n){var r=e.prototype[n];return void 0===r.$expr&&(r.$expr=function(){$stackDepthOffset--;try{return e.wrapped&&(arguments[0]=new e(arguments[0])),Function.call.apply(r,arguments)}finally{$stackDepthOffset++}}),r.$expr},$ifaceMethodExprs={},$ifaceMethodExpr=function(e){var n=$ifaceMethodExprs[\"$\"+e];return void 0===n&&(n=$ifaceMethodExprs[\"$\"+e]=function(){$stackDepthOffset--;try{return Function.call.apply(arguments[0][e],arguments)}finally{$stackDepthOffset++}}),n},$subslice=function(e,n,r,t){void 0===r&&(r=e.$length),void 0===t&&(t=e.$capacity),(n<0||r<n||t<r||r>e.$capacity||t>e.$capacity)&&$throwRuntimeError(\"slice bounds out of range\");var i=new e.constructor(e.$array);return i.$offset=e.$offset+n,i.$length=r-n,i.$capacity=t-n,i},$substring=function(e,n,r){return(n<0||r<n||r>e.length)&&$throwRuntimeError(\"slice bounds out of range\"),e.substring(n,r)},$sliceToArray=function(e){return e.$array.constructor!==Array?e.$array.subarray(e.$offset,e.$offset+e.$length):e.$array.slice(e.$offset,e.$offset+e.$length)},$decodeRune=function(e,n){var r=e.charCodeAt(n);if(r<128)return[r,1];if(r!=r||r<192)return[65533,1];var t=e.charCodeAt(n+1);if(t!=t||t<128||192<=t)return[65533,1];if(r<224)return(a=(31&r)<<6|63&t)<=127?[65533,1]:[a,2];var i=e.charCodeAt(n+2);if(i!=i||i<128||192<=i)return[65533,1];if(r<240)return(a=(15&r)<<12|(63&t)<<6|63&i)<=2047?[65533,1]:55296<=a&&a<=57343?[65533,1]:[a,3];var a,o=e.charCodeAt(n+3);return o!=o||o<128||192<=o?[65533,1]:r<248?(a=(7&r)<<18|(63&t)<<12|(63&i)<<6|63&o)<=65535||1114111<a?[65533,1]:[a,4]:[65533,1]},$encodeRune=function(e){return(e<0||e>1114111||55296<=e&&e<=57343)&&(e=65533),e<=127?String.fromCharCode(e):e<=2047?String.fromCharCode(192|e>>6,128|63&e):e<=65535?String.fromCharCode(224|e>>12,128|e>>6&63,128|63&e):String.fromCharCode(240|e>>18,128|e>>12&63,128|e>>6&63,128|63&e)},$stringToBytes=function(e){for(var n=new Uint8Array(e.length),r=0;r<e.length;r++)n[r]=e.charCodeAt(r);return n},$bytesToString=function(e){if(0===e.$length)return\"\";for(var n=\"\",r=0;r<e.$length;r+=1e4)n+=String.fromCharCode.apply(void 0,e.$array.subarray(e.$offset+r,e.$offset+Math.min(e.$length,r+1e4)));return n},$stringToRunes=function(e){for(var n,r=new Int32Array(e.length),t=0,i=0;i<e.length;i+=n[1],t++)n=$decodeRune(e,i),r[t]=n[0];return r.subarray(0,t)},$runesToString=function(e){if(0===e.$length)return\"\";for(var n=\"\",r=0;r<e.$length;r++)n+=$encodeRune(e.$array[e.$offset+r]);return n},$copyString=function(e,n){for(var r=Math.min(n.length,e.$length),t=0;t<r;t++)e.$array[e.$offset+t]=n.charCodeAt(t);return r},$copySlice=function(e,n){var r=Math.min(n.$length,e.$length);return $copyArray(e.$array,n.$array,e.$offset,n.$offset,r,e.constructor.elem),r},$copyArray=function(e,n,r,t,i,a){if(0!==i&&(e!==n||r!==t))if(n.subarray)e.set(n.subarray(t,t+i),r);else{switch(a.kind){case $kindArray:case $kindStruct:if(e===n&&r>t){for(var o=i-1;o>=0;o--)a.copy(e[r+o],n[t+o]);return}for(o=0;o<i;o++)a.copy(e[r+o],n[t+o]);return}if(e===n&&r>t)for(o=i-1;o>=0;o--)e[r+o]=n[t+o];else for(o=0;o<i;o++)e[r+o]=n[t+o]}},$clone=function(e,n){var r=n.zero();return n.copy(r,e),r},$pointerOfStructConversion=function(e,n){void 0===e.$proxies&&(e.$proxies={},e.$proxies[e.constructor.string]=e);var r=e.$proxies[n.string];if(void 0===r){for(var t={},i=0;i<n.elem.fields.length;i++)!function(n){t[n]={get:function(){return e[n]},set:function(r){e[n]=r}}}(n.elem.fields[i].prop);(r=Object.create(n.prototype,t)).$val=r,e.$proxies[n.string]=r,r.$proxies=e.$proxies}return r},$append=function(e){return $internalAppend(e,arguments,1,arguments.length-1)},$appendSlice=function(e,n){if(n.constructor===String){var r=$stringToBytes(n);return $internalAppend(e,r,0,r.length)}return $internalAppend(e,n.$array,n.$offset,n.$length)},$internalAppend=function(e,n,r,t){if(0===t)return e;var i=e.$array,a=e.$offset,o=e.$length+t,$=e.$capacity;if(o>$)if(a=0,$=Math.max(o,e.$capacity<1024?2*e.$capacity:Math.floor(5*e.$capacity/4)),e.$array.constructor===Array){(i=e.$array.slice(e.$offset,e.$offset+e.$length)).length=$;for(var c=e.constructor.elem.zero,u=e.$length;u<$;u++)i[u]=c()}else(i=new e.$array.constructor($)).set(e.$array.subarray(e.$offset,e.$offset+e.$length));$copyArray(i,n,a+e.$length,r,t,e.constructor.elem);var l=new e.constructor(i);return l.$offset=a,l.$length=o,l.$capacity=$,l},$equal=function(e,n,r){if(r===$jsObjectPtr)return e===n;switch(r.kind){case $kindComplex64:case $kindComplex128:return e.$real===n.$real&&e.$imag===n.$imag;case $kindInt64:case $kindUint64:return e.$high===n.$high&&e.$low===n.$low;case $kindArray:if(e.length!==n.length)return!1;for(var t=0;t<e.length;t++)if(!$equal(e[t],n[t],r.elem))return!1;return!0;case $kindStruct:for(t=0;t<r.fields.length;t++){var i=r.fields[t];if(!$equal(e[i.prop],n[i.prop],i.typ))return!1}return!0;case $kindInterface:return $interfaceIsEqual(e,n);default:return e===n}},$interfaceIsEqual=function(e,n){return e===$ifaceNil||n===$ifaceNil?e===n:e.constructor===n.constructor&&(e.constructor===$jsObjectPtr?e.object===n.object:(e.constructor.comparable||$throwRuntimeError(\"comparing uncomparable type \"+e.constructor.string),$equal(e.$val,n.$val,e.constructor)))},$min=Math.min,$mod=function(e,n){return e%n},$parseInt=parseInt,$parseFloat=function(e){return void 0!==e&&null!==e&&e.constructor===Number?e:parseFloat(e)},$froundBuf=new Float32Array(1),$fround=Math.fround||function(e){return $froundBuf[0]=e,$froundBuf[0]},$imul=Math.imul||function(e,n){var r=65535&e,t=65535&n;return r*t+((e>>>16&65535)*t+r*(n>>>16&65535)<<16>>>0)>>0},$floatKey=function(e){return e!=e?\"NaN$\"+ ++$idCounter:String(e)},$flatten64=function(e){return 4294967296*e.$high+e.$low},$shiftLeft64=function(e,n){return 0===n?e:n<32?new e.constructor(e.$high<<n|e.$low>>>32-n,e.$low<<n>>>0):n<64?new e.constructor(e.$low<<n-32,0):new e.constructor(0,0)},$shiftRightInt64=function(e,n){return 0===n?e:n<32?new e.constructor(e.$high>>n,(e.$low>>>n|e.$high<<32-n)>>>0):n<64?new e.constructor(e.$high>>31,e.$high>>n-32>>>0):e.$high<0?new e.constructor(-1,4294967295):new e.constructor(0,0)},$shiftRightUint64=function(e,n){return 0===n?e:n<32?new e.constructor(e.$high>>>n,(e.$low>>>n|e.$high<<32-n)>>>0):n<64?new e.constructor(0,e.$high>>>n-32):new e.constructor(0,0)},$mul64=function(e,n){var r=0,t=0;0!=(1&n.$low)&&(r=e.$high,t=e.$low);for(var i=1;i<32;i++)0!=(n.$low&1<<i)&&(r+=e.$high<<i|e.$low>>>32-i,t+=e.$low<<i>>>0);for(i=0;i<32;i++)0!=(n.$high&1<<i)&&(r+=e.$low<<i);return new e.constructor(r,t)},$div64=function(e,n,r){0===n.$high&&0===n.$low&&$throwRuntimeError(\"integer divide by zero\");var t=1,i=1,a=e.$high,o=e.$low;a<0&&(t=-1,i=-1,a=-a,0!==o&&(a--,o=4294967296-o));var $=n.$high,c=n.$low;n.$high<0&&(t*=-1,$=-$,0!==c&&($--,c=4294967296-c));for(var u=0,l=0,s=0;$<2147483648&&(a>$||a===$&&o>c);)$=($<<1|c>>>31)>>>0,c=c<<1>>>0,s++;for(var f=0;f<=s;f++)u=u<<1|l>>>31,l=l<<1>>>0,(a>$||a===$&&o>=c)&&(a-=$,(o-=c)<0&&(a--,o+=4294967296),4294967296===++l&&(u++,l=0)),c=(c>>>1|$<<31)>>>0,$>>>=1;return r?new e.constructor(a*i,o*i):new e.constructor(u*t,l*t)},$divComplex=function(e,n){var r=e.$real===1/0||e.$real===-1/0||e.$imag===1/0||e.$imag===-1/0,t=n.$real===1/0||n.$real===-1/0||n.$imag===1/0||n.$imag===-1/0,i=!r&&(e.$real!=e.$real||e.$imag!=e.$imag),a=!t&&(n.$real!=n.$real||n.$imag!=n.$imag);if(i||a)return new e.constructor(NaN,NaN);if(r&&!t)return new e.constructor(1/0,1/0);if(!r&&t)return new e.constructor(0,0);if(0===n.$real&&0===n.$imag)return 0===e.$real&&0===e.$imag?new e.constructor(NaN,NaN):new e.constructor(1/0,1/0);if(Math.abs(n.$real)<=Math.abs(n.$imag)){var o=n.$real/n.$imag,$=n.$real*o+n.$imag;return new e.constructor((e.$real*o+e.$imag)/$,(e.$imag*o-e.$real)/$)}o=n.$imag/n.$real,$=n.$imag*o+n.$real;return new e.constructor((e.$imag*o+e.$real)/$,(e.$imag-e.$real*o)/$)},$kindBool=1,$kindInt=2,$kindInt8=3,$kindInt16=4,$kindInt32=5,$kindInt64=6,$kindUint=7,$kindUint8=8,$kindUint16=9,$kindUint32=10,$kindUint64=11,$kindUintptr=12,$kindFloat32=13,$kindFloat64=14,$kindComplex64=15,$kindComplex128=16,$kindArray=17,$kindChan=18,$kindFunc=19,$kindInterface=20,$kindMap=21,$kindPtr=22,$kindSlice=23,$kindString=24,$kindStruct=25,$kindUnsafePointer=26,$methodSynthesizers=[],$addMethodSynthesizer=function(e){null!==$methodSynthesizers?$methodSynthesizers.push(e):e()},$synthesizeMethods=function(){$methodSynthesizers.forEach(function(e){e()}),$methodSynthesizers=null},$ifaceKeyFor=function(e){if(e===$ifaceNil)return\"nil\";var n=e.constructor;return n.string+\"$\"+n.keyFor(e.$val)},$identity=function(e){return e},$typeIDCounter=0,$idKey=function(e){return void 0===e.$id&&($idCounter++,e.$id=$idCounter),String(e.$id)},$newType=function(e,n,r,t,i,a,o){var $;switch(n){case $kindBool:case $kindInt:case $kindInt8:case $kindInt16:case $kindInt32:case $kindUint:case $kindUint8:case $kindUint16:case $kindUint32:case $kindUintptr:case $kindUnsafePointer:($=function(e){this.$val=e}).wrapped=!0,$.keyFor=$identity;break;case $kindString:($=function(e){this.$val=e}).wrapped=!0,$.keyFor=function(e){return\"$\"+e};break;case $kindFloat32:case $kindFloat64:($=function(e){this.$val=e}).wrapped=!0,$.keyFor=function(e){return $floatKey(e)};break;case $kindInt64:($=function(e,n){this.$high=e+Math.floor(Math.ceil(n)/4294967296)>>0,this.$low=n>>>0,this.$val=this}).keyFor=function(e){return e.$high+\"$\"+e.$low};break;case $kindUint64:($=function(e,n){this.$high=e+Math.floor(Math.ceil(n)/4294967296)>>>0,this.$low=n>>>0,this.$val=this}).keyFor=function(e){return e.$high+\"$\"+e.$low};break;case $kindComplex64:($=function(e,n){this.$real=$fround(e),this.$imag=$fround(n),this.$val=this}).keyFor=function(e){return e.$real+\"$\"+e.$imag};break;case $kindComplex128:($=function(e,n){this.$real=e,this.$imag=n,this.$val=this}).keyFor=function(e){return e.$real+\"$\"+e.$imag};break;case $kindArray:($=function(e){this.$val=e}).wrapped=!0,$.ptr=$newType(4,$kindPtr,\"*\"+r,!1,\"\",!1,function(e){this.$get=function(){return e},this.$set=function(e){$.copy(this,e)},this.$val=e}),$.init=function(e,n){$.elem=e,$.len=n,$.comparable=e.comparable,$.keyFor=function(n){return Array.prototype.join.call($mapArray(n,function(n){return String(e.keyFor(n)).replace(/\\\\/g,\"\\\\\\\\\").replace(/\\$/g,\"\\\\$\")}),\"$\")},$.copy=function(n,r){$copyArray(n,r,0,0,r.length,e)},$.ptr.init($),Object.defineProperty($.ptr.nil,\"nilCheck\",{get:$throwNilPointerError})};break;case $kindChan:($=function(e){this.$val=e}).wrapped=!0,$.keyFor=$idKey,$.init=function(e,n,r){$.elem=e,$.sendOnly=n,$.recvOnly=r};break;case $kindFunc:($=function(e){this.$val=e}).wrapped=!0,$.init=function(e,n,r){$.params=e,$.results=n,$.variadic=r,$.comparable=!1};break;case $kindInterface:($={implementedBy:{},missingMethodFor:{}}).keyFor=$ifaceKeyFor,$.init=function(e){$.methods=e,e.forEach(function(e){$ifaceNil[e.prop]=$throwNilPointerError})};break;case $kindMap:($=function(e){this.$val=e}).wrapped=!0,$.init=function(e,n){$.key=e,$.elem=n,$.comparable=!1};break;case $kindPtr:($=o||function(e,n,r){this.$get=e,this.$set=n,this.$target=r,this.$val=this}).keyFor=$idKey,$.init=function(e){$.elem=e,$.wrapped=e.kind===$kindArray,$.nil=new $($throwNilPointerError,$throwNilPointerError)};break;case $kindSlice:($=function(e){e.constructor!==$.nativeArray&&(e=new $.nativeArray(e)),this.$array=e,this.$offset=0,this.$length=e.length,this.$capacity=e.length,this.$val=this}).init=function(e){$.elem=e,$.comparable=!1,$.nativeArray=$nativeArray(e.kind),$.nil=new $([])};break;case $kindStruct:($=function(e){this.$val=e}).wrapped=!0,$.ptr=$newType(4,$kindPtr,\"*\"+r,!1,i,a,o),$.ptr.elem=$,$.ptr.prototype.$get=function(){return this},$.ptr.prototype.$set=function(e){$.copy(this,e)},$.init=function(e,n){$.pkgPath=e,$.fields=n,n.forEach(function(e){e.typ.comparable||($.comparable=!1)}),$.keyFor=function(e){var r=e.$val;return $mapArray(n,function(e){return String(e.typ.keyFor(r[e.prop])).replace(/\\\\/g,\"\\\\\\\\\").replace(/\\$/g,\"\\\\$\")}).join(\"$\")},$.copy=function(e,r){for(var t=0;t<n.length;t++){var i=n[t];switch(i.typ.kind){case $kindArray:case $kindStruct:i.typ.copy(e[i.prop],r[i.prop]);continue;default:e[i.prop]=r[i.prop];continue}}};var r={};n.forEach(function(e){r[e.prop]={get:$throwNilPointerError,set:$throwNilPointerError}}),$.ptr.nil=Object.create(o.prototype,r),$.ptr.nil.$val=$.ptr.nil,$addMethodSynthesizer(function(){var e=function(e,n,r){void 0===e.prototype[n.prop]&&(e.prototype[n.prop]=function(){var e=this.$val[r.prop];return r.typ===$jsObjectPtr&&(e=new $jsObjectPtr(e)),void 0===e.$val&&(e=new r.typ(e)),e[n.prop].apply(e,arguments)})};n.forEach(function(n){n.anonymous&&($methodSet(n.typ).forEach(function(r){e($,r,n),e($.ptr,r,n)}),$methodSet($ptrType(n.typ)).forEach(function(r){e($.ptr,r,n)}))})})};break;default:$panic(new $String(\"invalid kind: \"+n))}switch(n){case $kindBool:case $kindMap:$.zero=function(){return!1};break;case $kindInt:case $kindInt8:case $kindInt16:case $kindInt32:case $kindUint:case $kindUint8:case $kindUint16:case $kindUint32:case $kindUintptr:case $kindUnsafePointer:case $kindFloat32:case $kindFloat64:$.zero=function(){return 0};break;case $kindString:$.zero=function(){return\"\"};break;case $kindInt64:case $kindUint64:case $kindComplex64:case $kindComplex128:var c=new $(0,0);$.zero=function(){return c};break;case $kindPtr:case $kindSlice:$.zero=function(){return $.nil};break;case $kindChan:$.zero=function(){return $chanNil};break;case $kindFunc:$.zero=function(){return $throwNilPointerError};break;case $kindInterface:$.zero=function(){return 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$kindInt:return Int32Array;case $kindInt8:return Int8Array;case $kindInt16:return Int16Array;case $kindInt32:return Int32Array;case $kindUint:return Uint32Array;case $kindUint8:return Uint8Array;case $kindUint16:return Uint16Array;case $kindUint32:case $kindUintptr:return Uint32Array;case $kindFloat32:return Float32Array;case $kindFloat64:return Float64Array;default:return Array}},$toNativeArray=function(e,n){var r=$nativeArray(e);return r===Array?n:new r(n)},$arrayTypes={},$arrayType=function(e,n){var r=e.id+\"$\"+n,t=$arrayTypes[r];return void 0===t&&(t=$newType(12,$kindArray,\"[\"+n+\"]\"+e.string,!1,\"\",!1,null),$arrayTypes[r]=t,t.init(e,n)),t},$chanType=function(e,n,r){var t=(r?\"<-\":\"\")+\"chan\"+(n?\"<- \":\" \")+e.string,i=n?\"SendChan\":r?\"RecvChan\":\"Chan\",a=e[i];return void 0===a&&(a=$newType(4,$kindChan,t,!1,\"\",!1,null),e[i]=a,a.init(e,n,r)),a},$Chan=function(e,n){(n<0||n>2147483647)&&$throwRuntimeError(\"makechan: size out of 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{}\";0!==e.length&&(t=\"interface { \"+$mapArray(e,function(e){return(\"\"!==e.pkg?e.pkg+\".\":\"\")+e.name+e.typ.string.substr(4)}).join(\"; \")+\" }\"),r=$newType(8,$kindInterface,t,!1,\"\",!1,null),$interfaceTypes[n]=r,r.init(e)}return r},$emptyInterface=$interfaceType([]),$ifaceNil={},$error=$newType(8,$kindInterface,\"error\",!0,\"\",!1,null);$error.init([{prop:\"Error\",name:\"Error\",pkg:\"\",typ:$funcType([],[$String],!1)}]);var $panicValue,$jsObjectPtr,$jsErrorPtr,$mapTypes={},$mapType=function(e,n){var r=e.id+\"$\"+n.id,t=$mapTypes[r];return void 0===t&&(t=$newType(4,$kindMap,\"map[\"+e.string+\"]\"+n.string,!1,\"\",!1,null),$mapTypes[r]=t,t.init(e,n)),t},$makeMap=function(e,n){for(var r={},t=0;t<n.length;t++){var i=n[t];r[e(i.k)]=i}return r},$ptrType=function(e){var n=e.ptr;return void 0===n&&(n=$newType(4,$kindPtr,\"*\"+e.string,!1,\"\",e.exported,null),e.ptr=n,n.init(e)),n},$newDataPointer=function(e,n){return n.elem.kind===$kindStruct?e:new n(function(){return e},function(n){e=n})},$indexPtr=function(e,n,r){return e.$ptr=e.$ptr||{},e.$ptr[n]||(e.$ptr[n]=new r(function(){return e[n]},function(r){e[n]=r}))},$sliceType=function(e){var n=e.slice;return void 0===n&&(n=$newType(12,$kindSlice,\"[]\"+e.string,!1,\"\",!1,null),e.slice=n,n.init(e)),n},$makeSlice=function(e,n,r){r=r||n,(n<0||n>2147483647)&&$throwRuntimeError(\"makeslice: len out of range\"),(r<0||r<n||r>2147483647)&&$throwRuntimeError(\"makeslice: cap out of range\");var t=new e.nativeArray(r);if(e.nativeArray===Array)for(var i=0;i<r;i++)t[i]=e.elem.zero();var a=new e(t);return a.$length=n,a},$structTypes={},$structType=function(e,n){var r=$mapArray(n,function(e){return e.name+\",\"+e.typ.id+\",\"+e.tag}).join(\"$\"),t=$structTypes[r];if(void 0===t){var i=\"struct { \"+$mapArray(n,function(e){return e.name+\" \"+e.typ.string+(\"\"!==e.tag?' \"'+e.tag.replace(/\\\\/g,\"\\\\\\\\\").replace(/\"/g,'\\\\\"')+'\"':\"\")}).join(\"; \")+\" }\";0===n.length&&(i=\"struct {}\"),t=$newType(0,$kindStruct,i,!1,\"\",!1,function(){this.$val=this;for(var e=0;e<n.length;e++){var r=n[e],t=arguments[e];this[r.prop]=void 0!==t?t:r.typ.zero()}}),$structTypes[r]=t,t.init(e,n)}return t},$assertType=function(e,n,r){var t,i=n.kind===$kindInterface,a=\"\";if(e===$ifaceNil)t=!1;else if(i){var o=e.constructor.string;if(void 0===(t=n.implementedBy[o])){t=!0;for(var $=$methodSet(e.constructor),c=n.methods,u=0;u<c.length;u++){for(var l=c[u],s=!1,f=0;f<$.length;f++){var d=$[f];if(d.name===l.name&&d.pkg===l.pkg&&d.typ===l.typ){s=!0;break}}if(!s){t=!1,n.missingMethodFor[o]=l.name;break}}n.implementedBy[o]=t}t||(a=n.missingMethodFor[o])}else t=e.constructor===n;if(!t){if(r)return[n.zero(),!1];$panic(new $packages.runtime.TypeAssertionError.ptr(\"\",e===$ifaceNil?\"\":e.constructor.string,n.string,a))}return i||(e=e.$val),n===$jsObjectPtr&&(e=e.object),r?[e,!0]:e},$stackDepthOffset=0,$getStackDepth=function(){var e=new Error;if(void 0!==e.stack)return $stackDepthOffset+e.stack.split(\"\\n\").length},$panicStackDepth=null,$callDeferred=function(e,n,r){if(!r&&null!==e&&e.index>=$curGoroutine.deferStack.length)throw n;if(null!==n){var t=null;try{$curGoroutine.deferStack.push(e),$panic(new $jsErrorPtr(n))}catch(e){t=e}return $curGoroutine.deferStack.pop(),void $callDeferred(e,t)}if(!$curGoroutine.asleep){$stackDepthOffset--;var i=$panicStackDepth,a=$panicValue,o=$curGoroutine.panicStack.pop();void 0!==o&&($panicStackDepth=$getStackDepth(),$panicValue=o);try{for(;;){if(null===e&&void 0===(e=$curGoroutine.deferStack[$curGoroutine.deferStack.length-1])){if($panicStackDepth=null,o.Object instanceof Error)throw o.Object;var $;throw $=o.constructor===$String?o.$val:void 0!==o.Error?o.Error():void 0!==o.String?o.String():o,new Error($)}var c=e.pop();if(void 0===c){if($curGoroutine.deferStack.pop(),void 0!==o){e=null;continue}return}var u=c[0].apply(c[2],c[1]);if(u&&void 0!==u.$blk){if(e.push([u.$blk,[],u]),r)throw null;return}if(void 0!==o&&null===$panicStackDepth)throw null}}finally{void 0!==o&&(null!==$panicStackDepth&&$curGoroutine.panicStack.push(o),$panicStackDepth=i,$panicValue=a),$stackDepthOffset++}}},$panic=function(e){$curGoroutine.panicStack.push(e),$callDeferred(null,null,!0)},$recover=function(){return null===$panicStackDepth||void 0!==$panicStackDepth&&$panicStackDepth!==$getStackDepth()-2?$ifaceNil:($panicStackDepth=null,$panicValue)},$throw=function(e){throw e},$noGoroutine={asleep:!1,exit:!1,deferStack:[],panicStack:[]},$curGoroutine=$noGoroutine,$totalGoroutines=0,$awakeGoroutines=0,$checkForDeadlock=!0,$mainFinished=!1,$go=function(e,n){$totalGoroutines++,$awakeGoroutines++;var r=function(){try{$curGoroutine=r;var t=e.apply(void 0,n);if(t&&void 0!==t.$blk)return e=function(){return t.$blk()},void(n=[]);r.exit=!0}catch(e){if(!r.exit)throw e}finally{$curGoroutine=$noGoroutine,r.exit&&($totalGoroutines--,r.asleep=!0),r.asleep&&($awakeGoroutines--,!$mainFinished&&0===$awakeGoroutines&&$checkForDeadlock&&(console.error(\"fatal error: all goroutines are asleep - deadlock!\"),void 0!==$global.process&&$global.process.exit(2)))}};r.asleep=!1,r.exit=!1,r.deferStack=[],r.panicStack=[],$schedule(r)},$scheduled=[],$runScheduled=function(){try{for(var e;void 0!==(e=$scheduled.shift());)e()}finally{$scheduled.length>0&&setTimeout($runScheduled,0)}},$schedule=function(e){e.asleep&&(e.asleep=!1,$awakeGoroutines++),$scheduled.push(e),$curGoroutine===$noGoroutine&&$runScheduled()},$setTimeout=function(e,n){return $awakeGoroutines++,setTimeout(function(){$awakeGoroutines--,e()},n)},$block=function(){$curGoroutine===$noGoroutine&&$throwRuntimeError(\"cannot block in JavaScript callback, fix by wrapping code in goroutine\"),$curGoroutine.asleep=!0},$send=function(e,n){e.$closed&&$throwRuntimeError(\"send on closed channel\");var r=e.$recvQueue.shift();if(void 0===r){if(!(e.$buffer.length<e.$capacity)){var t,i=$curGoroutine;return e.$sendQueue.push(function(e){return t=e,$schedule(i),n}),$block(),{$blk:function(){t&&$throwRuntimeError(\"send on closed channel\")}}}e.$buffer.push(n)}else r([n,!0])},$recv=function(e){var n=e.$sendQueue.shift();void 0!==n&&e.$buffer.push(n(!1));var r=e.$buffer.shift();if(void 0!==r)return[r,!0];if(e.$closed)return[e.$elem.zero(),!1];var t=$curGoroutine,i={$blk:function(){return this.value}};return e.$recvQueue.push(function(e){i.value=e,$schedule(t)}),$block(),i},$close=function(e){for(e.$closed&&$throwRuntimeError(\"close of closed channel\"),e.$closed=!0;;){var n=e.$sendQueue.shift();if(void 0===n)break;n(!0)}for(;;){var r=e.$recvQueue.shift();if(void 0===r)break;r([e.$elem.zero(),!1])}},$select=function(e){for(var n=[],r=-1,t=0;t<e.length;t++){var i,a=(i=e[t])[0];switch(i.length){case 0:r=t;break;case 1:(0!==a.$sendQueue.length||0!==a.$buffer.length||a.$closed)&&n.push(t);break;case 2:a.$closed&&$throwRuntimeError(\"send on closed channel\"),(0!==a.$recvQueue.length||a.$buffer.length<a.$capacity)&&n.push(t)}}if(0!==n.length&&(r=n[Math.floor(Math.random()*n.length)]),-1!==r)switch((i=e[r]).length){case 0:return[r];case 1:return[r,$recv(i[0])];case 2:return $send(i[0],i[1]),[r]}var o=[],$=$curGoroutine,c={$blk:function(){return this.selection}},u=function(){for(var e=0;e<o.length;e++){var n=o[e],r=n[0],t=r.indexOf(n[1]);-1!==t&&r.splice(t,1)}};for(t=0;t<e.length;t++)!function(n){var r=e[n];switch(r.length){case 1:var t=function(e){c.selection=[n,e],u(),$schedule($)};o.push([r[0].$recvQueue,t]),r[0].$recvQueue.push(t);break;case 2:t=function(){return r[0].$closed&&$throwRuntimeError(\"send on closed channel\"),c.selection=[n],u(),$schedule($),r[1]};o.push([r[0].$sendQueue,t]),r[0].$sendQueue.push(t)}}(t);return $block(),c},$needsExternalization=function(e){switch(e.kind){case $kindBool:case $kindInt:case $kindInt8:case $kindInt16:case $kindInt32:case $kindUint:case $kindUint8:case $kindUint16:case $kindUint32:case $kindUintptr:case $kindFloat32:case $kindFloat64:return!1;default:return e!==$jsObjectPtr}},$externalize=function(e,n){if(n===$jsObjectPtr)return e;switch(n.kind){case $kindBool:case $kindInt:case $kindInt8:case $kindInt16:case $kindInt32:case $kindUint:case $kindUint8:case $kindUint16:case $kindUint32:case $kindUintptr:case $kindFloat32:case $kindFloat64:return e;case $kindInt64:case $kindUint64:return $flatten64(e);case $kindArray:return $needsExternalization(n.elem)?$mapArray(e,function(e){return $externalize(e,n.elem)}):e;case $kindFunc:return $externalizeFunction(e,n,!1);case $kindInterface:return e===$ifaceNil?null:e.constructor===$jsObjectPtr?e.$val.object:$externalize(e.$val,e.constructor);case $kindMap:for(var r={},t=$keys(e),i=0;i<t.length;i++){var a=e[t[i]];r[$externalize(a.k,n.key)]=$externalize(a.v,n.elem)}return r;case $kindPtr:return e===n.nil?null:$externalize(e.$get(),n.elem);case $kindSlice:return $needsExternalization(n.elem)?$mapArray($sliceToArray(e),function(e){return $externalize(e,n.elem)}):$sliceToArray(e);case $kindString:if($isASCII(e))return e;var o,$=\"\";for(i=0;i<e.length;i+=o[1]){var c=(o=$decodeRune(e,i))[0];if(c>65535){var u=Math.floor((c-65536)/1024)+55296,l=(c-65536)%1024+56320;$+=String.fromCharCode(u,l)}else $+=String.fromCharCode(c)}return $;case $kindStruct:var s=$packages.time;if(void 0!==s&&e.constructor===s.Time.ptr){var f=$div64(e.UnixNano(),new $Int64(0,1e6));return new Date($flatten64(f))}var d={},p=function(e,n){if(n===$jsObjectPtr)return e;switch(n.kind){case $kindPtr:return e===n.nil?d:p(e.$get(),n.elem);case $kindStruct:var r=n.fields[0];return p(e[r.prop],r.typ);case $kindInterface:return p(e.$val,e.constructor);default:return d}},h=p(e,n);if(h!==d)return h;h={};for(i=0;i<n.fields.length;i++){var k=n.fields[i];k.exported&&(h[k.name]=$externalize(e[k.prop],k.typ))}return h}$throwRuntimeError(\"cannot externalize \"+n.string)},$externalizeFunction=function(e,n,r){return e===$throwNilPointerError?null:(void 0===e.$externalizeWrapper&&($checkForDeadlock=!1,e.$externalizeWrapper=function(){for(var t=[],i=0;i<n.params.length;i++){if(n.variadic&&i===n.params.length-1){for(var a=n.params[i].elem,o=[],$=i;$<arguments.length;$++)o.push($internalize(arguments[$],a));t.push(new n.params[i](o));break}t.push($internalize(arguments[i],n.params[i]))}var c=e.apply(r?this:void 0,t);switch(n.results.length){case 0:return;case 1:return $externalize(c,n.results[0]);default:for(i=0;i<n.results.length;i++)c[i]=$externalize(c[i],n.results[i]);return c}}),e.$externalizeWrapper)},$internalize=function(e,n,r){if(n===$jsObjectPtr)return e;if(n===$jsObjectPtr.elem&&$throwRuntimeError(\"cannot internalize js.Object, use *js.Object instead\"),e&&void 0!==e.__internal_object__)return $assertType(e.__internal_object__,n,!1);var t=$packages.time;if(void 0!==t&&n===t.Time)return null!==e&&void 0!==e&&e.constructor===Date||$throwRuntimeError(\"cannot internalize time.Time from \"+typeof e+\", must be Date\"),t.Unix(new $Int64(0,0),new $Int64(0,1e6*e.getTime()));switch(n.kind){case $kindBool:return void 0!==e&&null!=e&&(e.constructor!==Boolean&&$throwRuntimeError(\"tried to internalize non-bool value of type \"+$typeof(e)),Boolean(e));case $kindInt:return parseInt(e);case $kindInt8:return parseInt(e)<<24>>24;case $kindInt16:return parseInt(e)<<16>>16;case $kindInt32:return parseInt(e)>>0;case $kindUint:return parseInt(e);case $kindUint8:return parseInt(e)<<24>>>24;case $kindUint16:return parseInt(e)<<16>>>16;case $kindUint32:case $kindUintptr:return parseInt(e)>>>0;case $kindInt64:case $kindUint64:return new n(0,e);case $kindFloat32:case $kindFloat64:return parseFloat(e);case $kindArray:return e.length!==n.len&&$throwRuntimeError(\"got array with wrong size from JavaScript native\"),$mapArray(e,function(e){return $internalize(e,n.elem)});case $kindFunc:return function(){for(var t=[],i=0;i<n.params.length;i++){if(n.variadic&&i===n.params.length-1){for(var a=n.params[i].elem,o=arguments[i],$=0;$<o.$length;$++)t.push($externalize(o.$array[o.$offset+$],a));break}t.push($externalize(arguments[i],n.params[i]))}var c=e.apply(r,t);switch(n.results.length){case 0:return;case 1:return $internalize(c,n.results[0]);default:for(i=0;i<n.results.length;i++)c[i]=$internalize(c[i],n.results[i]);return c}};case $kindInterface:if(0!==n.methods.length&&$throwRuntimeError(\"cannot internalize \"+n.string),null===e||void 0===e)return $ifaceNil;switch(e.constructor){case Int8Array:return new($sliceType($Int8))(e);case Int16Array:return new($sliceType($Int16))(e);case Int32Array:return new($sliceType($Int))(e);case Uint8Array:return new($sliceType($Uint8))(e);case Uint16Array:return new($sliceType($Uint16))(e);case Uint32Array:return new($sliceType($Uint))(e);case Float32Array:return new($sliceType($Float32))(e);case Float64Array:return new($sliceType($Float64))(e);case Array:return $internalize(e,$sliceType($emptyInterface));case Boolean:return new $Bool(!!e);case Date:return void 0===t?new $jsObjectPtr(e):new t.Time($internalize(e,t.Time));case Function:var i=$funcType([$sliceType($emptyInterface)],[$jsObjectPtr],!0);return new i($internalize(e,i));case Number:return new $Float64(parseFloat(e));case String:return new $String($internalize(e,$String));default:if($global.Node&&e instanceof $global.Node)return new $jsObjectPtr(e);var a=$mapType($String,$emptyInterface);return new a($internalize(e,a))}case $kindMap:for(var o={},$=$keys(e),c=0;c<$.length;c++){var u=$internalize($[c],n.key);o[n.key.keyFor(u)]={k:u,v:$internalize(e[$[c]],n.elem)}}return o;case $kindPtr:if(n.elem.kind===$kindStruct)return $internalize(e,n.elem);case $kindSlice:return new n($mapArray(e,function(e){return $internalize(e,n.elem)}));case $kindString:if(void 0===e||null==e)return\"\";if(e.constructor!==String&&$throwRuntimeError(\"tried to internalize non-string value of type \"+$typeof(e)),e=String(e),$isASCII(e))return e;var l=\"\";for(c=0;c<e.length;){var s=e.charCodeAt(c);if(55296<=s&&s<=56319){var f=e.charCodeAt(c+1);l+=$encodeRune(1024*(s-55296)+f-56320+65536),c+=2}else l+=$encodeRune(s),c++}return l;case $kindStruct:var d={},p=function(n){if(n===$jsObjectPtr)return e;switch(n===$jsObjectPtr.elem&&$throwRuntimeError(\"cannot internalize js.Object, use *js.Object instead\"),n.kind){case $kindPtr:return p(n.elem);case $kindStruct:var r=n.fields[0],t=p(r.typ);if(t!==d){var i=new n.ptr;return i[r.prop]=t,i}return d;default:return d}},h=p(n);if(h!==d)return h}$throwRuntimeError(\"cannot internalize \"+n.string)},$typeof=function(e){return void 0===e?\"undefined\":null===e?\"null\":typeof e+\"/\"+e.constructor.name},$isASCII=function(e){for(var n=0;n<e.length;n++)if(e.charCodeAt(n)>=128)return!1;return!0};\n"
diff --git a/js/js.go b/js/js.go
index 3fbf1d88c..af212651f 100644
--- a/js/js.go
+++ b/js/js.go
@@ -1,28 +1,60 @@
-// Package js provides functions for interacting with native JavaScript APIs. Calls to these functions are treated specially by GopherJS and translated directly to their corresponding JavaScript syntax.
+// Package js provides functions for interacting with native JavaScript APIs.
+// Calls to these functions are treated specially by GopherJS and translated
+// directly to their corresponding JavaScript syntax.
 //
-// Use MakeWrapper to expose methods to JavaScript. When passing values directly, the following type conversions are performed:
+// Use MakeWrapper to expose methods to JavaScript.
 //
-//  | Go type               | JavaScript type       | Conversions back to interface{} |
-//  | --------------------- | --------------------- | ------------------------------- |
-//  | bool                  | Boolean               | bool                            |
-//  | integers and floats   | Number                | float64                         |
-//  | string                | String                | string                          |
-//  | []int8                | Int8Array             | []int8                          |
-//  | []int16               | Int16Array            | []int16                         |
-//  | []int32, []int        | Int32Array            | []int                           |
-//  | []uint8               | Uint8Array            | []uint8                         |
-//  | []uint16              | Uint16Array           | []uint16                        |
-//  | []uint32, []uint      | Uint32Array           | []uint                          |
-//  | []float32             | Float32Array          | []float32                       |
-//  | []float64             | Float64Array          | []float64                       |
-//  | all other slices      | Array                 | []interface{}                   |
-//  | arrays                | see slice type        | see slice type                  |
-//  | functions             | Function              | func(...interface{}) *js.Object |
-//  | time.Time             | Date                  | time.Time                       |
-//  | -                     | instanceof Node       | *js.Object                      |
-//  | maps, structs         | instanceof Object     | map[string]interface{}          |
+// Internalization
 //
-// Additionally, for a struct containing a *js.Object field, only the content of the field will be passed to JavaScript and vice versa.
+// When values pass from Javascript to Go, a process known as internalization,
+// the following conversion table is applied:
+//
+//  |----------------+---------------+-------------------------+--------|
+//  | Go target type | Translation   | Javascript source value | Result |
+//  |----------------+---------------+-------------------------+--------|
+//  | string         | UTF16 -> UTF8 | null                    | ""     |
+//  |                |               | undefined               | ""     |
+//  |                |               | ""                      | ""     |
+//  |                |               | new String("")          | ""     |
+//  |                |               | "ok" †                  | "ok"   |
+//  |                |               | new String("ok") †      | "ok"   |
+//  |----------------+---------------+-------------------------+--------|
+//  | bool           | none          | null                    | false  |
+//  |                |               | undefined               | false  |
+//  |                |               | false †                 | false  |
+//  |                |               | new Boolean(false) †    | false  |
+//  |----------------+---------------+-------------------------+--------|
+//
+// Any source values not listed in this table cause a runtime panic for a given
+// target type if a conversion is attempted, e.g. a Javascript number value
+// being assigned to a string type Go variable.
+//
+// Source values annotated with † are generally applicable to all valid
+// values of the target type. e.g. for target type string, "ok" represents
+// all valid string primitive values.
+//
+// Externalization
+//
+// When values pass from Go to Javascript, a process known as externalization,
+// the following conversion table is applied:
+//
+//  |----------------+---------------+-----------------+--------+---------+-------------|
+//  | Go source type | Translation   | Go source value | Result | typeof  | constructor |
+//  |----------------+---------------+-----------------+--------+---------+-------------|
+//  | string         | UTF8 -> UTF16 | ""              | ""     | string  | String      |
+//  |                |               | "ok" †          | "ok"   |         |             |
+//  |----------------+---------------+-----------------+--------+---------+-------------|
+//  | bool           | none          | false           | false  | boolean | Boolean     |
+//  |                |               | true            | true   |         |             |
+//  |----------------+---------------+-----------------+--------+---------+-------------|
+//
+// Source values annotated with † are generally applicable to all valid
+// values of the target type. e.g. for target type string, "ok" represents
+// all valid string values.
+//
+// Special struct types
+//
+// To follow....
 package js
 
 // Object is a container for a native JavaScript object. Calls to its methods are treated specially by GopherJS and translated directly to their JavaScript syntax. A nil pointer to Object is equal to JavaScript's "null". Object can not be used as a map key.
diff --git a/js/js_test.go b/js/js_test.go
index 39afc530d..af0bf9719 100644
--- a/js/js_test.go
+++ b/js/js_test.go
@@ -467,7 +467,7 @@ func TestCallWithNull(t *testing.T) {
 func TestReflection(t *testing.T) {
 	o := js.Global.Call("eval", "({ answer: 42 })")
 	if reflect.ValueOf(o).Interface().(*js.Object) != o {
-		t.Fail()
+		t.Fatal()
 	}
 
 	type S struct {
@@ -477,18 +477,19 @@ func TestReflection(t *testing.T) {
 
 	v := reflect.ValueOf(&s).Elem()
 	if v.Field(0).Interface().(*js.Object).Get("answer").Int() != 42 {
-		t.Fail()
+		t.Fatal()
 	}
 	if v.Field(0).MethodByName("Get").Call([]reflect.Value{reflect.ValueOf("answer")})[0].Interface().(*js.Object).Int() != 42 {
-		t.Fail()
+		t.Fatal()
 	}
 	v.Field(0).Set(reflect.ValueOf(js.Global.Call("eval", "({ answer: 100 })")))
 	if s.Field.Get("answer").Int() != 100 {
-		t.Fail()
+		t.Fatal()
 	}
 
-	if fmt.Sprintf("%+v", s) != "{Field:[object Object]}" {
-		t.Fail()
+	expFmt := "{Field:[object Object]}"
+	if v := fmt.Sprintf("%+v", s); v != expFmt {
+		t.Fatalf("fmt out was: %q; expected %q", v, expFmt)
 	}
 }
 
@@ -620,3 +621,207 @@ func TestStructWithNonIdentifierJSTag(t *testing.T) {
 		t.Errorf("value via js.Object.Get gave %q, want %q", got, want)
 	}
 }
+
+// Internalize is used as a helper type to test $internalize. A struct is used
+// in order that all of the Go types can be verified (otherwise we are limited
+// to the methods on *Object). Where methods on *Object exist they too will be
+// tested
+type Internalize struct {
+	*js.Object
+
+	string string `js:"string"`
+	bool   bool   `js:"bool"`
+}
+
+func TestInternalizeString(t *testing.T) {
+	fieldName := "string"
+	zero := ""
+
+	s := &Internalize{Object: js.Global.Get("Object").New()}
+
+	// *************
+	// undefined
+	// *************
+	s.Object.Set(fieldName, jsundefined())
+
+	// via struct field
+	if v := s.string; v != zero {
+		t.Fatalf("expected string field to be %q, got %q", zero, v)
+	}
+
+	// via *js.Object.String()
+	if v := s.Object.Get(fieldName).String(); v != zero {
+		t.Fatalf("expected string field via *js.Object.String() to be %q, got %q", zero, v)
+	}
+
+	// *************
+	// null
+	// *************
+	s.Object.Set(fieldName, jsnull())
+
+	// via struct field
+	if v := s.string; v != zero {
+		t.Fatalf("expected string field to be %q, got %q", zero, v)
+	}
+
+	// via *js.Object.String()
+	if v := s.Object.Get(fieldName).String(); v != zero {
+		t.Fatalf("expected string field via *js.Object.String() to be %q, got %q", zero, v)
+	}
+
+	// *************
+	// valid primitive string
+	// *************
+	exp := "ok"
+	s.Object.Set(fieldName, jsval(`"`+exp+`"`))
+
+	// via struct field
+	if v := s.string; v != exp {
+		t.Fatalf("expected string field to be %q, got %q", zero, v)
+	}
+
+	// via *js.Object.String()
+	if v := s.Object.Get(fieldName).String(); v != exp {
+		t.Fatalf("expected string field via *js.Object.String() to be %q, got %q", zero, v)
+	}
+
+	// *************
+	// valid String object
+	// *************
+	s.Object.Set(fieldName, jsval(`new String("`+exp+`")`))
+
+	// via struct field
+	if v := s.string; v != exp {
+		t.Fatalf("expected string field to be %q, got %q", zero, v)
+	}
+
+	// via *js.Object.String()
+	if v := s.Object.Get(fieldName).String(); v != exp {
+		t.Fatalf("expected string field via *js.Object.String() to be %q, got %q", zero, v)
+	}
+
+	// *************
+	// invalid
+	// *************
+	s.Object.Set(fieldName, jsval("5"))
+
+	shouldRuntimePanic(t, "runtime error: tried to internalize non-string value of type number/Number", func() {
+		_ = s.string
+	})
+
+	shouldRuntimePanic(t, "runtime error: tried to internalize non-string value of type number/Number", func() {
+		_ = s.Object.Get(fieldName).String()
+	})
+}
+
+func TestInternalizeBool(t *testing.T) {
+	fieldName := "bool"
+	zero := false
+
+	s := &Internalize{Object: js.Global.Get("Object").New()}
+
+	// *************
+	// undefined
+	// *************
+	s.Object.Set(fieldName, jsundefined())
+
+	// via struct field
+	if v := s.bool; v != zero {
+		t.Fatalf("expected bool field to be %q, got %q", zero, v)
+	}
+
+	// via *js.Object.Bool()
+	if v := s.Object.Get(fieldName).Bool(); v != zero {
+		t.Fatalf("expected bool field via *js.Object.Bool() to be %q, got %q", zero, v)
+	}
+
+	// *************
+	// null
+	// *************
+	s.Object.Set(fieldName, jsnull())
+
+	// via struct field
+	if v := s.bool; v != zero {
+		t.Fatalf("expected bool field to be %q, got %q", zero, v)
+	}
+
+	// via *js.Object.Bool()
+	if v := s.Object.Get(fieldName).Bool(); v != zero {
+		t.Fatalf("expected bool field via *js.Object.Bool() to be %q, got %q", zero, v)
+	}
+
+	// *************
+	// valid primitive bool
+	// *************
+	exp := true
+	s.Object.Set(fieldName, jsval(`true`))
+
+	// via struct field
+	if v := s.bool; v != exp {
+		t.Fatalf("expected bool field to be %v, got %v", exp, v)
+	}
+
+	// via *js.Object.Bool()
+	if v := s.Object.Get(fieldName).Bool(); v != exp {
+		t.Fatalf("expected bool field via *js.Object.Bool() to be %q, got %q", zero, v)
+	}
+
+	// *************
+	// valid Bool object
+	// *************
+	s.Object.Set(fieldName, jsval(`new Boolean(true)`))
+
+	// via struct field
+	if v := s.bool; v != exp {
+		t.Fatalf("expected bool field to be %q, got %q", zero, v)
+	}
+
+	// via *js.Object.Bool()
+	if v := s.Object.Get(fieldName).Bool(); v != exp {
+		t.Fatalf("expected bool field via *js.Object.Bool() to be %q, got %q", zero, v)
+	}
+
+	// *************
+	// invalid
+	// *************
+	s.Object.Set(fieldName, jsval("5"))
+
+	shouldRuntimePanic(t, "runtime error: tried to internalize non-bool value of type number/Number", func() {
+		_ = s.bool
+	})
+
+	shouldRuntimePanic(t, "runtime error: tried to internalize non-bool value of type number/Number", func() {
+		_ = s.Object.Get(fieldName).Bool()
+	})
+}
+
+func jsval(v string) *js.Object {
+	return js.Global.Call("eval", v)
+}
+
+func jsnull() *js.Object {
+	return js.Global.Call("eval", "null")
+}
+
+func jsundefined() *js.Object {
+	return js.Global.Call("eval", "undefined")
+}
+
+func consolelog(args ...interface{}) {
+	js.Global.Get("console").Call("log", args...)
+}
+
+func shouldRuntimePanic(t *testing.T, msg string, f func()) {
+	defer func() {
+		err, ok := recover().(error)
+		if !ok {
+			t.Fatalf("expected to have had to handle panic; we didn't see a panic")
+		}
+
+		if err.Error() != msg {
+			t.Fatalf("expected error %q, got %q", msg, err)
+		}
+	}()
+
+	f()
+}