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Previously, block gaps could only be created by warp sync, but block gaps will also be generated by fast sync once #5406 is fixed. This PR is part 1 of the detailed implementation plan in #5406 (comment): refactor
BlockGap
.This refactor converts the existing
(NumberFor<Block>, NumberFor<Block>)
into a dedicatedBlockGap<NumberFor<Block>>
struct. This change is purely structural and does not alter existing logic, but lays the groundwork for the follow-up PR.The compatibility concern caused by the new structure is addressed in the second commit.
cc @dmitry-markin