IdentityDictionary documentation

# IdentityDictionary

IdentityDictionary inherits from Dictionary and defines no instance variables. It has no subclasses.

IdentityDictionaries use identity (==) and identity hashing (identityHash) to arrange keys.
IdentityDictionaries should be used in preference to Dictionaries whenever possible because many IdentityDictionary methods are implemented as fast primitive operations (Note: not yet).

## Methods defined in IdentityDictionary:

### Methods for private:

- findKeyOrNil: key

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