func Y1(tk obj.Token, args []oop.VarDef) oop.Val {
	val := args[0].Val
	if val.Type != oop.Int && val.Type != oop.Float {
		val.Data = 0.0
	}
	return oop.Val{Data: math.Y1(val.Data.(float64)), Type: oop.Float}
}
Y1 built-in math function.
package stdmath
import (
	"math"
	"github.com/fract-lang/fract/oop"
	"github.com/fract-lang/fract/pkg/obj"
)
func Y0(tk obj.Token, args []oop.VarDef) oop.Val {
	val := args[0].Val
	if val.Type != oop.Int && val.Type != oop.Float {
		val.Data = 0.0
	}
	return oop.Val{Data: math.Y0(val.Data.(float64)), Type: oop.Float}
}