sub method
Subtract arg from this.
Implementation
void sub(Vector2 arg) {
  final argStorage = arg._v2storage;
  _v2storage[1] -= argStorage[1];
  _v2storage[0] -= argStorage[0];
}Subtract arg from this.
void sub(Vector2 arg) {
  final argStorage = arg._v2storage;
  _v2storage[1] -= argStorage[1];
  _v2storage[0] -= argStorage[0];
}