R1:f75c7ce7664b

arc liberate

Summary: See Q134; Introduced in D25598.

Test Plan: unit tests

Reviewers: O1 Blessed Committers, aklapper

Reviewed By: O1 Blessed Committers, aklapper

Subscribers: aklapper, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Differential Revision: https://we.phorge.it/D25603