Provides information about 'Map' collections, which are collections of information with a key/value relationship.
The following are the list of keys which this supplier will return a value for.
Simply returns the item stored with the supplied key, which could be pretty much anything.
(Since 2.0.0) Returns the complete list of entries in the map.
If you actually want the key value called '@all', you can escape it by doubling the '@'. I.e. put