Tim Peters <t...@python.org> added the comment:

Note that Sunday doesn't care (at all) where mismatches occur. The "natural" 
way to add Sunday: follow pure C-P unless/until it finds a mismatching 
position. Pure C-P then computes a specific shift. Nothing about that changes. 
But something is added: also compute the shift Sunday suggests, and pick the 
larger of that and what C-P computed.

C-P and Sunday both have cases where they can justify "supernaturally large" 
shifts (i.e., as long as len(needle), or even that +1 for Sunday), and they're 
not always the same cases.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41972>
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