Hashes Key:Value hashes or dictionaries. Interface to implementations of key:value hashes either in memory, on disk and with persistence. Keys may have multiple and duplicate values. @world: @name: @string: @Returns: @world: @name: @array: @Returns: @old_hash: @Returns: @hash: @hash: @key: @Returns: @hash: @key: @Returns: @hash: @key: @Returns: @hash: @key: @Returns: @hash: @key: @value: @Returns: @hash: @fh: @hash: @fh: @hash: @key_string: @fh: @template_string: @dictionary: @prefix: @suffix: @Returns: