@michaelsbradleyjr commented in this PR that more validations in fromV3 would be useful:

I do think it would be a good idea to do a bit more options checking for uuid, iv, and salt options, i.e. to make sure that they're the expected length and valid hex (per the discussion in Discord last Thursday). Can we introduce that improvement in another PR?

I'm opening this issue to track the suggestion and any possible implementation.