docs: private int toModifierFlags (int mods) {
      return modifierFlags((mods & GLFW_MOD_ALT) != 0,
                           (mods & GLFW_MOD_CONTROL) != 0,
                           (mods & GLFW_MOD_SUPER) != 0,
                           (mods & GLFW_MOD_SHIFT) != 0);
    }