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phases: avoid N² behavior in `advanceboundary`...

phases: avoid N² behavior in `advanceboundary` We allowed duplicated entries in the deque, which each entry could potentially insert all its ancestors. So advancing boundary for the full repository would mean each revision would walk all its ancestors, resulting in O(N²) iteration. For repository of any decent size, N² is quickly insane. We introduce a simple set to avoid this and get back to reasonable performance.

Gregory Szorc - - Load All Authors

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      from typing import Optional

      version: int

      def b85encode(text: bytes, pad: Optional[int]) -> bytes: ...

      def b85decode(text: bytes) -> bytes: ...

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				from typing import Optional

				version: int

				def b85encode(text: bytes, pad: Optional[int]) -> bytes: ...
				def b85decode(text: bytes) -> bytes: ...