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Problem: Check for overflow in put count does not work well.
Solution: Improve the overflow check. (Ozaki Kiichi, closes vim/vim#9102)
https://github.com/vim/vim/commit/fa53722367c3793fda95dac665af74b8651065e9
Add some casts as Nvim uses size_t variables in some places.
We could technically adjust the logic to check for overflow outside of size_t's
range, but it's much easier to just port the patch exactly (also means we can
use the same tests).
v:sizeoflong is N/A, so convert the 64-bit tests to Lua and use the FFI to check
long's size.
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