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This is a follow up to #1109. It adds an explicit
Prov
tag, which is important for manipulating and observingProvenance
s. This PR also improves general handling and printing ofProvenance
. Note that (likeEnv
) there is currently no readable form forProvenance
— and (unlikeEnv
) it's unclear whether there should be one.This PR is a straightforward and strict improvement — without which debugging of the
Provenance
refactor (working toward a sponge transcript) will be impossible.