Where is the discussion on this PEP going to be? In this thread, or a new thread? Sorry for not having followed these closely enough to know. I'd like to point out that boost-histogram and xarray (at least) would love this as well, as we both (independently) came up with dict-in-index workarounds for missing keyword arguments. An argument for "why not a function call" could be added: function calls do not allow assignment, so `h[x=3] = ...` does not have a pretty functional replacement.

Also, maybe a mention as to why simply making a new set of magic methods, `__get_item__(self, *args, **kwargs)` for example, is not a valid option? The nice thing about that is the current oddity that you can't tell `[(1,2)]` from `[1, 2]` could also be fixed, along with avoiding all the special cases mentioned (which are pretty safe). Then a class that defines the new magic methods would use those instead of the old one, similar to getslice/setslice/delslice?
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