[issue31984] startswith and endswith leak implementation details

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

See issue24284. `s1.startswith(s2, start, end)` for non-negative indices and non-tuple s2 is equivalent to expressions

    start + len(s2) <= end and s2[start: start + len(s2)] == s2

or
    s1.find(s2, start, end) == start

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue31984>
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