Adds support for symbols as keys in Maps.#1392

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abacaphiliac wants to merge 11 commits intoimmutable-js:masterfrom

abacaphiliac:map-key-symbols

Commits on Oct 16, 2017

Adds support for symbols as keys in Maps.
abacaphiliac
committed

Commits on Oct 18, 2017

Skip concat in Map instantiation and loop in shallowCopy when objects do not have any Symbols.
abacaphiliac
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Commits on Oct 19, 2017

Merge remote-tracking branch 'facebook/master' into map-key-symbols
abacaphiliac
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Commits on Oct 26, 2017

removes Symbol-handling logic from Seq and shallowCopy due to performance issues. adds named constructor to Map which recursively converts object literal KV pairs into [K, V] form, in which Map cor…
abacaphiliac
committed

Commits on May 18, 2018