Add tests for mixed numerical type conversions of tunable config data from storage

[bpkroth]

Closes #669

[motus]

Looks good + a few nitpicks.

P.S. I don't quite like that the mixed_numerics_exp_storage fixture returns an experiment detached from its context (i.e., after Experiment._teardown() has been called internally), but I guess that's ok for tests. I'll think about it later.

[bpkroth]

Looks good + a few nitpicks.

P.S. I don't quite like that the mixed_numerics_exp_storage fixture returns an experiment detached from its context (i.e., after Experiment._teardown() has been called internally), but I guess that's ok for tests. I'll think about it later.

I actually copied that one from your original exp_storage example.
I think the way that pytest handles that is that the context doesn't actually exit until the fixture is no longer in scope.
That pattern is also used for our docker based tests.

[bpkroth]

Looks good + a few nitpicks.
P.S. I don't quite like that the mixed_numerics_exp_storage fixture returns an experiment detached from its context (i.e., after Experiment._teardown() has been called internally), but I guess that's ok for tests. I'll think about it later.

I actually copied that one from your original exp_storage example. I think the way that pytest handles that is that the context doesn't actually exit until the fixture is no longer in scope. That pattern is also used for our docker based tests.

Actually, we might need to use yield for that instead. Let's take that up in the next PR.