Joshua Landau added the comment:
> The problem with using STORE_MAP is you create a new dict for each keyword
> argument in that situation.
You don't; if you look at the disassembly for producing a built-in dict
("dis.dis('{1:2, 2:3, 3:4}')") you'll see they use STORE_MAP too. STORE_MAP
seems to just be the map equivalent of LIST_APPEND.
I've done simple timings that show my version being faster...
Unfortunately, it points out there is definitely a memory leak. This reproduces:
def f(a):
pass
while True:
f(**{}, a=1)
This goes for both patches 8 and 9.
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<http://bugs.python.org/issue2292>
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