Serhiy Storchaka added the comment:
I have just tested. BUILD_CONST_KEY_MAP doesn't used in it, because at this
time -0. still is not a constant, but an expression (negation of 0.). With -0
it doesn't work too.
$ ./python -m dis
{0: 1, 2: 3}
1 0 LOAD_CONST 0 (1)
2 LOAD_CONST 1 (3)
4 LOAD_CONST 2 ((0, 2))
6 BUILD_CONST_KEY_MAP 2
8 POP_TOP
10 LOAD_CONST 3 (None)
12 RETURN_VALUE
$ ./python -m dis
{-0: 1, 2: 3}
1 0 LOAD_CONST 5 (0)
2 LOAD_CONST 1 (1)
4 LOAD_CONST 2 (2)
6 LOAD_CONST 3 (3)
8 BUILD_MAP 2
10 POP_TOP
12 LOAD_CONST 4 (None)
14 RETURN_VALUE
----------
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<http://bugs.python.org/issue27140>
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