It would be nice if ObjectAlreadyExists exception had field with existing object

[retnuh]

It would be nice to get the existing object from the exception, rather than having to potentially scan all the objects to find the correct one, when handling the ObjectAlreadyExists exception.

[FragmentedPacket]

I may be able to account for this within #70 as it was asked in the feedback.

[dgarros]

Fixed in #70