I'm wondering whether parens should be required when there are both
keyword args and more than one positional arg in an index. I.e instead
of

     a[1, 2, k = 3]

you would have to write

     a[(1, 2), k = 3]

That would make it clearer that the indexing syntax still really only 

takes one positional arg,

and why, if you transform it into

     idx = (1, 2)
     a[idx, k = 3]

you don't/can't write it as

     a[*idx, k = 3]

--
Greg
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