{('answer'): <class 'foolscap.call.AnswerUnslicer'>,
 ('call'): <class 'foolscap.call.CallUnslicer'>,
 ('error'): <class 'foolscap.call.ErrorUnslicer'>}

PBOpenRegistry

Value:

{('arguments'): <class 'foolscap.call.ArgumentUnslicer'>,
 ('my-reference'): <class 'foolscap.referenceable.ReferenceUnslicer'>,
 ('their-reference'): <class 'foolscap.referenceable.TheirReferenceUns
licer'>,
 ('your-reference'): <class 'foolscap.referenceable.YourReferenceUnsli
cer'>}

PBStorageOpenRegistry

Value:

{('their-reference'): <class 'foolscap.referenceable.TheirReferenceUns
licer'>}