gh-96436: add flag to opt out of sequence index adjustment #96437
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This is a draft implementation of the proposal in #96436 to add a flag to opt out of sequence index adjustment.
It currently only implements the "Python class" case as well as demonstrates how the
tuple
builtin could also potentially change to make use of this flag (if desired).PySequence_GetItem
adjusting negative indexes make it difficult to handle them properly #96436