[Issue 21772] [REG2.069] Consecutive different-signed `double.nan`s in an array literal take the sign of the previous nan (same for `float` and `real`)

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=21772

--- Comment #1 from Nathan S. <n8sh.secondary at hotmail.com> ---
If you go all the way back to 2.068.2 `std.stdio.writeln` doesn't print the
sign of nan by default but you can verify with `std.math.signbit` that the nans
have different signs.

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