[Issue 5232] [patch] std.conv.to & std.conv.roundTo report invalid overflows for very large numbers

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=5232

--- Comment #3 from berni44 <bugzilla at d-ecke.de> ---
The proposed solution doesn't work, because x87er reals cannot save values
between ulong.max and ulong.max + 1. And for real==double this should also not
work.

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