irmin-pack: Replace Io_legacy for Io #2268
Merged
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This PR aims to remove the old Io_legacy module, and use Io instead.
Because it might have a lot of side effect and impact, it tries to change the behavior of the code in the minimal way possible.
Instead it was mostly about replacing Io_legacy for Io.
One of the artefact of the old code is the presence of a
dead_header
, which is not in use and a relicate of the past, however I kept it to stay compatible with older stores.A lof of thanks to @art-w for the help provided