When passed a key that is present in the map, {@code asMap().get(Object)} has the same behavior as {@link #get}, returning a live collection. When passed a key that is not present, however, {@code asMap().get(Object)} returns {@code null} instead of an empty collection. @return a map view from a key to its collection of values
The Map itself and any items it references, directly or indirectly must be of a class of one of the following:
Warning: this operation may be called frequently; if so care should be taken so that the map contents (if calculated) be cached as appropriate. @return the object's contents as a map
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