… tests.

…h by redefining CollectionIterator to only use conditional types to determine the potential key type for the iterator.

…and updating the base each tests to be a more interesting and abbreviated.

…iteratee tests for find, filter, and reject more realistic by using potentially falsy types.

…ing it got updated at some point and I forgot to remove it at that time.

…ways a function.

…es instead of types and updating MemoCollectionIterator to use the same pattern as CollectionIterator.

… usages elsewhere in these definitions.

…of the extends checks in MemoCollectionIterator seems to have gotten rid of the result narrowing issue that was previously preventing that from working.

…referenced.

…e Underscore and _Chain versions of them to use T instead of TypeOfCollection<V> more often.

… longer referenced."

This reverts commit 53d6759.

…erator types.

…k to not using T in a few places to compensate.

…e end of those types.