Use default_factory for OPV

[cmungall]

Addresses #140 but this likely needs done in other places

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[cmungall]

sorry, I was too lazy to add a unit test!

[vchendrix]

Thanks for the pointer @cmungall ! We appreciate your attention to this.

[vchendrix]

sorry, I was too lazy to add a unit test!

No worries @cmungall. We will be more formally addressing this anyway.