[Issue 20708] result of cast not specified when value is out of range

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20708

--- Comment #2 from Nick Treleaven <nick at geany.org> ---
> Issue 22527 for float -> int was fixed.

See:
https://dlang.org/spec/expression.html#cast_floating

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