Is this a breaking change? It feels borderline.
Keyword-only subscripts are permitted. The positional index will be the empty tuple:
obj[spam=1, eggs=2]
# calls type(obj).__getitem__(obj, (), spam=1, eggs=2)
I.e. consider:
>>> d = dict()
>>> d[()] = "foo"
>>> d
{(): 'foo'}
I don't really object to this fact, and one could argue it's not a breaking change since a built-in dict will simply raise an exception with keyword arguments. However, it does make the empty tuple the "default key" for new objects that will accept keyword indices.
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The dead increasingly dominate and strangle both the living and the
not-yet born. Vampiric capital and undead corporate persons abuse
the lives and control the thoughts of homo faber. Ideas, once born,
become abortifacients against new conceptions.