1vanK said:
Why it's need to write @obj = @obj2 in AS if user almost always want to copy a reference?

Just a minor observation. You don't need to use @ on both sides. Just on the left is enough to indicate that it is a handle assignment, i.e. @obj = obj2;

Deleted

Some problem with asEP_DISALLOW_VALUE_ASSIGN_FOR_REF_TYPE and 2d arrays:

Original sprite atlas: https://github.com/dviglo2d/sprite_manipulator/blob/main/res/src_atlas.png

After commit https://github.com/dviglo2d/sprite_manipulator/commit/f58b1db2c91f98174da4531bf8fce9e117f4e4f4 code

Image@[]@[]@ tiles = split(src_atlas, src_tile_size);
tiles[0][0].save_png(base_path + "tile_0_0.png");

saves white square (with real indices [1][0]) instead green

Joined tiles https://github.com/dviglo2d/sprite_manipulator/blob/dissalow/res/exp_atlas.png

instead https://github.com/dviglo2d/sprite_manipulator/blob/main/res/exp_atlas.png

Script before commit: https://github.com/dviglo2d/sprite_manipulator/blob/main/res/main.as

After: https://github.com/dviglo2d/sprite_manipulator/blob/dissalow/res/main.as

daScript have := operator for clone object https://daslang.io/doc/reference/language/clone.html

By the way, LUA does not hesitate to break backward compatibility in each version, although many people use it https://www.lua.org/versions.html

I don't either. But there has to be a compelling reason to change the design in the first place.