Arbitrary keys

[jayvdb]

piskvorky/sqlitedict#73 and piskvorky/sqlitedict#74 are about non-string/arbitrary keys.

It would be a useful addition to this library also.

[jayvdb]

Maybe this is already supported somehow, but not yet documented.

I see key_transform which could do the trick.

[jayvdb]

I think I have my problem solved, using key_transform for crazy keys and jsonpickle for crazy values. Doing a large test run now.