PhutilOpaqueEnvelopeKeyClassHolds the key for @{class:PhutilOpaqueEnvelope} in a logically distant
location so it will never appear in stack traces, etc. You should never need
to use this class directly. See @{class:PhutilOpaqueEnvelope} for
information about opaque envelopes.PhutilOpaqueEnvelopeKeyClassHolds the key for @{class:PhutilOpaqueEnvelope} in a logically distant
location so it will never appear in stack traces, etc. You should never need
to use this class directly. See @{class:PhutilOpaqueEnvelope} for
information about opaque envelopes.