Docs are needed for the new handling of overflow of
short int operations. Would you mind adding these?

This affects x+y, x-y, x*y, x/y, x%y, divmod(x, y),
x**y, pow(x, y[, z]), and -x.

The rules are as follows:

- If an int result overflows, the (new) OverflowWarning
warning is issued (with a message argument indicating
the operation, e.g. "integer addition").

- This warning is ignored by default.

- The warning can be controlled like all warnings, via
the -W command line option (use
-Wdefault::OverflowWarning to cause the warning to be
issued) or via the warnings.filterwarnings() call.

- Unless the warning is turned into an error, the
result is recomputed after converting the arguments to
long ints.

- If the warning is turned into an error, OverflowError
is substituted (for backwards compatibility).

PS. Is it documented yet that
int-to-the-negative-int-power now returns a float?

Thanks!

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Bumped priority.

No, the int-to-negative-int-power behavior has not been documented.

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The behaviour changed, there's no need of this docs.