git fast-import --export-marks flag

Hi,

git fast-import --export-marks is able to export to a file the marks and
its associated commit hashes created during import.

So far I've seen the marks are not the ones provided in the input but
some "internal ones" not related with the input.

Wouldn't it be much better, for import/export interop, if it kept the
original marks?

It would be certainly easier to do incremental import/export with
external systems not dealing with SHAs...

Thanks,

pablo