DID Method requirements (revocability)

During the W3C call this morning, one issue that was highlighted was
whether or not a DID needs to support the ability to be revoked in order to
claim compliance with the standard.

This prompted a question for me.  Does anyone know how many of the DID
methods supported via https://uniresolver.io/ do the revocation check as
part of the read/verify step?

Also, in re-reading the DID spec, I notice it does not specifically mention
doing this check during the Read/Verify step.  Would it be worth adding
some language clarifying that implementors should do this?

   -chrisb