"Opinionated" CommonDomain

[andreabalducci]

In our projects we have forked common domain to

• have typed ids instead of guids
• have a clear separation from Aggregate and his state
• support automatic snapshots
• check invariants
• simplify testing

Will be valuable for the project to have an "opitionated NEventStore.Domain" instead of the current one?

[AGiorgetti]

we've also did:

• typed ids (with some optional mechanics to check coherence between aggregate type and id type, this is active only in debug builds)
• tweaked snapshot support (we also have aggregate internal state in a separate class)
• invariant checking (on demand or right before every save)
• changed the aggregate construction so you must provide a valid Id for it to be created (an aggregate should not exist without an id)