True if the relative timestamp order on every shared timestamped slot agrees across the two registries. Catches LWW-bookkeeping bugs that `value_equal` deliberately ignores. For every pair of shared keys (a, b), checks that `self[a].cmp(self[b])` and `other[a].cmp(other[b])` are compatible: `Equal` on either side is always compatible; otherwise both sides must agree on direction. Equality on one
(&self, other: &Self)
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