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[GSoC] Discussion of "Submodule related work" project

Have some questions about "Submodule related work" project

First of all, I would like to add this task to the project, if I'll take it:
What do you think about this task?

> Cleanup our test suite. Do not use a repo itself as a submodule for itself

Not quite familiar with submodules yet, why this is considered to be ineligible
(i.e. using repo as a submodule for itself)?

> (Advanced datastructure knowledge required?) Protect submodule from gc-ing
> interesting HEADS.

Can you provide a small example that shows the problem, please?
And why advanced datastructure knowledge is expected?

Maybe you have something else about this project to say.

 Valery Tolstov