*1* In that sense, a more sensible order than rewriting "clone" in C in its current form would be to make necessary enhancements to the components in this sequence that need to implement clone, figure out how they should fit together and first make "clone" a four-liner shell script. Then rewriting the result in C may become more trivial.
On the other hand, a C version may have the necessary APIs available to support this kind of enhancement, but the APIs may not be there for a shell script.
It seems useless to have an option in "git remote add" just because it might be necessary in a future refactoring of "git clone", but without a good use case beside that one -- because right now "git remote add --mirror" is close to useless: anyone who needs it 99% of the time knows how to hack the config, unlike people who just want a quick way to remotely backup of their repository.
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