copysign with sign being a NaN can have non-portable results Follow-up to https://github.com/rust-lang/rust/pull/129559. Cc ```@tgross35``` ```@beetrees``` There's no portable variant we can recommend instead here, is there? Something with a semantics like "if `sign` is a NaN, then return `self` unaltered, otherwise return `self` with the sign changed to that of `sign`"? |
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