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What changes were proposed in this pull request?
Hides the
long
block id behind an interface.Why are the changes needed?
This hides implementation details behind a meaningful interface. The
long
representation of a block id is not use in many places but currently visible everywhere. This allows to replace the block id representation in the future without touching much code.This is based on #1723 (block id set) and turns the set of longs into a true set of
BlockId
s.Ultimately, this would allow to rework the structure of block id without touching many files (#1621).
Fix: # (issue)
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Unit and integration tests.