ddidderr e446d9b74f

rust version: backtracking simplified and other improvements ...

* backtracking: main loop simplified
* instead of the `fixed` Vec, we now use skip fields to calculate
  how many fields to skip in `next()` and `prev()`.
  This is faster because we get rid of the `if` statement
  thus no branching occurs.

2023-03-27 21:04:04 +02:00

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