Returns true if there are no entries.
Returns an in-order iterable of all keys.
Iterable for iterating this collection in reverse order.
Returns an in-order iterable of all values.
The version number used to track changes.
Protected
_addProtected
_getProtected
_setReturns true if the key exists and the value matches exactly.
Removes the first node and returns its value.
Removes the last node and returns its value.
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A collection for registering values by key. This base class is intended to facilitate specialized control. Sub-classes control how items are added.