Require VerifierPolicy not have isolated conformance #269
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Motivation
While conceptually it is possible for verifier policies to have isolated conformance, in practice the way PolicyBuilder is implemented makes that nearly impossible. Given that the utility of an isolated VerifierPolicy is very limited, let's just disallow it.
Modifications
Require VerifierPolicy to have a SendableMetatype
Result
Easier to build correct compositions over PolicyBuilder