Having a ".git" entry inside a tree can cause confusing
results on checkout. At the top-level, you could not
checkout such a tree, as it would complain about overwriting
the real ".git" directory. In a subdirectory, you might
check it out, but performing operations in the subdirectory
would confusingly consider the in-tree ".git" directory as
the repository.
[snip]
+       int has_dotgit = 0;


Name like "." or ".." are handled as directories by the OS.

".git" could be a file or a directory, at least in theory,
and from the OS point of view,
but we want to have this as a reserved name.

Looking at bad directory names, which gives trouble when checking out:

Should we check for "/" or "../blabla" as well?

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