Mark Dickinson added the comment:

> It doesn't cover the "sum with like signs"

Ah, sorry, yes it does;  it's in the previous paragraph.

"""
[...] the sign of a sum, or of a difference x−y regarded as a sum x+(−y), 
differs from at most one of the addends’ signs
"""

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<http://bugs.python.org/issue22548>
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