I've just come across the following remark in the wget manual page (1.10.2),
about the -c option:
> Wget has no way of verifying that the local file is really a valid prefix of
> the remote file.
This is not quite true. It could at least check the remote and local
file time stamps for this purpose, and I think it should do this.
It could also, as an option, load a couple of random bytes as a heuristic
quick check. (I wouldn't do this, though.)
In any case, the wrong claim "no way" should be removed from the man page.