stanncam Does Not Accurately Follow Instance with Zoom Magnification

[bfrymire]

The X and Y positions of the stanncam do not fully settle on at the follow instance's X and Y positions when using the zoom magnification. The camera position ends up being 2 pixels off from the expected position.

Reproductions steps:

stanncam_init(1920, 1080);
var _cam = new stanncam();
var _player = instance_create_depth(room_width * 0.5, room_height * 0.5, 0, obj_player);
_cam.bounds_w = 0;
_cam.bounds_h = 0;
_cam.follow = _player;
_cam.room_constrain = false;
_cam.zoom(0.25);
repeat (1000) {
    _cam.__step();
}
var __ = {
    camera_x: _cam.x,
    camera_y: _cam.y,
    player_x: _player.x,
    player_y: _player.y,
    assert: (_cam.x == _player.x && _cam.y == _player.y)
};
show_message(__);