func math.Signbit

8 uses

	math (current package)
		atan2.go#L37: 		if x >= 0 && !Signbit(x) {
		dim.go#L45: 		if Signbit(x) {
		dim.go#L72: 		if Signbit(x) {
		gamma.go#L139: 		if Signbit(x) {
		signbit.go#L8: func Signbit(x float64) bool {

	math/big
		float.go#L552: 	z.neg = math.Signbit(x) // handle -0, -Inf correctly

	src.elv.sh/pkg/eval/evaltest
		matchers.go#L25: 		math.Signbit(a) == math.Signbit(b) {