Is copy from wc to repo a "cheap" copy?

Hi,

If I checkout a revision from trunk and then copy the new WC to the
repo URL at tags/foo, is the copy just as cheap, in repo disk space
terms, as a directr URL to URL copy (normal tagging)? Obviously, it
will take longer, at least due to the check out, but that doesn't
matter to me.

The reason I ask, pushes the question further forward a bit: I want to
checkout a trunk revision, do some release work on it (add a change
note and build some released items, ...) and then but the whole lot
back to a release tag. I don't want to do this though if the majority
unchanged files where not stored cheaply.

If its not cheap, I guess I will be forced to do a URL to URL copy to
tags and then check that out, modify it and check back in - which is
not strictly tagging. Maybe I should use a release branch instead and
tag that when I'm done, but it seems like process overhead that I
don't need and will clutter the repo with useless branches.

Any other ideas?

Thanks,

-- 
> Nick Thompson
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