Chunk divides the map m into x parts and returns them as a list of chunks Useful for parallel processing of a map The ordering of keys between and within chunks is indeterminate If the chunks cannot contain the same number of keys, the last chunk will be longer If the map is not large enough to provide the requested number of chunks, a single chunk will be returned.

Clone returns a copy of the map m.

Keys returns the keys of the map m.

Values returns the values of the map m.