erigontech / erigontech/erigon

e3: perf of historical streams

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performance
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Description

Optimize `StateAsOfIterF`, `StateAsOfIterDB`, `DomainLatestIterFile` method `Next()` to not do `common.Copy`
Write unit-test for next invariant: value returned from `Next()` must be valid until next 2 `Next()` calls.
In-theory such invariant is enough to survive multiple `stream.Union` `stream.Intersect` compositions

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