[issue34397] remove redundant overflow checks in tuple and list implementations

[Tim Peters]

Tim Peters <tim at python.org> added the comment:

Because the behavior of signed integer overflow isn't defined in C.  Picture a 3-bit integer type, where the maximum value of the signed integer type is 3.  3+3 has no defined result.  Cast them to the unsigned flavor of the integer type, though, and the result is defined to be 6.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34397>
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