Fix GH-8778: Integer arithmethic with large number variants fails #8779
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When casting a `variant` to `int`, we need to heed the proper `zval` type, which is an signed 64bit integer on x64, while `VT_INT` is only a signed 32bit integer.
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When casting a
varianttoint, we need to heed the properzvaltype, which is an signed 64bit integer on x64, while
VT_INTis onlya signed 32bit integer.