code: func MathOpen(l *State) int {
  	NewLibrary(l, mathLibrary)
  	l.PushNumber(3.1415926535897932384626433832795) // TODO use math.Pi instead? Values differ.
  	l.SetField(-2, "pi")
  	l.PushNumber(math.MaxFloat64)
  	l.SetField(-2, "huge")
  	return 1
  }
docs: // MathOpen opens the math library. Usually passed to Require.