[issue14700] Integer overflow in classic string formatting

[Serhiy Storchaka]

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

> Your patch should also address possible overflow of the addition.

Here there is no overflow. The patch limits prec of a little stronger
(instead of 2147483647 to 2147483639 on a 32-bit platform).

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