func internal/strconv.underscoreOK

3 uses

	internal/strconv (current package)
		atof.go#L311: 	if underscores && !underscoreOK(s[:i]) {
		atoi.go#L140: 	if underscores && !underscoreOK(s0) {
		atoi.go#L252: func underscoreOK(s string) bool {