[issue5353] Improve IndexError messages with actual values

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

I've seen his patch and am working on my own variant that also attaches
the index value as a separate field in the args tuple.  The problem may
be that it slows down the code -- at first I thought that didn't matter,
but someone made a good effort to make the existing code fast (possibly
to support cases where IndexError is used for control flow instead of
for error conditions).

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