What does "consider it done" mean?

What does “consider it done” mean?

Think it finished

It’s similar to See sth done, to some extent.

It means, “You can be completely sure I will do it.” It is a promise so strong that the person who wants it should think of the task as already finished, even though it hasn’t been started yet.

Oh I got it. Consider here implies that it’s not been finished, right?

It has not even been started … but it WILL be done.