Convert dedicated dict_key type to a 1-element map #276
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This shaves 8 bits off an Object (48 -> 40). Some of this is immediately made back up by the overhead of dealing with a full-fledged map instead of a pair, but the use of dict_key is largely limited to function definitions.
This is just an initial proof-of-concept, if you don't have any problems with it I can remove the
{is/as}_dict_{key/obj}
methods entirely and refactor the rtorrent PR to match.