For which our wrapper had to be extended. One could argue that
`.call_git_items_()` would be at least as adequate, but I chose to
invest in my prior investments ;-)

The desire is to slim the interface.

To align with get_hexsha()

No StopIteration could have come out of that code block

…enerator

Fixes dataladgh-3827

This touches upon an idea by @yaricoptic expressed in
datalad#3827 (comment)
and merely lays the foundation for further work.

Names are not unique (and I don't see how they could be, or what we
would gain from it), hence no dict.

Choice of names is debatable too. But given that they are not used ATM,
it doesn't really matter and can easily be changed.

[ci skip]

Following a suggestion from @kyleam

Thanks @kyleam