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Currently, both of the following return false:
(-0.0 as f64).asinh().is_sign_negative() (-0.0 as f32).asinh().is_sign_negative()
However, in other languages like C, asinh(-0.0) would always return -0.0. We might need another fast case for 0.0 and -0.0 here:
asinh(-0.0)
-0.0
rust/src/libstd/f64.rs
Lines 833 to 839 in f01b9f8