Found in 1.13.0

This code (I assume) is trying to send the \b to the regex, but its being escaped by the JS

Should be something like "\b" + errorID + "\b"?

CODE:
} else if ( !describedBy.match( new RegExp( "\b" + errorID + "\b" ) ) ) {
// Add to end of list if not already present
describedBy += " " + errorID;
}

This creates loads of duplicate aria-describedby in the markup