Every member of an object was a call of write_cbor()/write_msgpack()/
write_ubjson() for its value, however simple: a function with a large frame
that saves and restores many registers around a single sink write.
Objects are now written by a function of their own, like arrays, in which
members with a null, boolean, integer, or string value (and a float, in UBJSON
and BJData) are written in place; anything else is passed on to the general
function. The depth limit and the recursion for nested values are unchanged.
Instructions per call (Linux, GCC 13, thousands), to_ubjson: 20000 small objects 17861 -> 14661, twitter 3271 -> 2798; to_bjdata: 20000 small objects 17881 -> 14681, twitter 3277 -> 2804; to_msgpack: twitter 2948 -> 2646.
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
Niels Lohmann
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