def fx_cls
import bend-collections-laws-math@1.0.0.0/src/math/f64.bend as F64import Base
849def fx_cls(+x: F64, top: Bool) -> F64 & Exp:
850 match top:
851 case True{}:
852 (nan_or(x, nz(frac(x))), Exp{False{}, 0n})
853 case False{}:
854 fx_z(x, is_zero(x))