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revlog: add a Rust implementation of `headrevsdiff`...

revlog: add a Rust implementation of `headrevsdiff` Python implementation of `headrevsdiff` can be very slow in the worst case compared with the `heads` computation it replaces, since the latter is done in Rust. Even the average case of this Python implementation is still noticeable in the profiles. This patch makes the computation much much faster by doing it in Rust.

Matt Harbison - - Load All Authors

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      from typing import Any, NewType, NoReturn, TypeVar, cast

      from . import Attribute, _OnSetAttrType

      _T = TypeVar("_T")

      def frozen(

          instance: Any, attribute: Attribute[Any], new_value: Any

      ) -> NoReturn: ...

      def pipe(*setters: _OnSetAttrType) -> _OnSetAttrType: ...

      def validate(instance: Any, attribute: Attribute[_T], new_value: _T) -> _T: ...

      # convert is allowed to return Any, because they can be chained using pipe.

      def convert(

          instance: Any, attribute: Attribute[Any], new_value: Any

      ) -> Any: ...

      _NoOpType = NewType("_NoOpType", object)

      NO_OP: _NoOpType

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				from typing import Any, NewType, NoReturn, TypeVar, cast

				from . import Attribute, _OnSetAttrType

				_T = TypeVar("_T")

				def frozen(
				instance: Any, attribute: Attribute[Any], new_value: Any
				) -> NoReturn: ...
				def pipe(*setters: _OnSetAttrType) -> _OnSetAttrType: ...
				def validate(instance: Any, attribute: Attribute[_T], new_value: _T) -> _T: ...

				# convert is allowed to return Any, because they can be chained using pipe.
				def convert(
				instance: Any, attribute: Attribute[Any], new_value: Any
				) -> Any: ...

				_NoOpType = NewType("_NoOpType", object)
				NO_OP: _NoOpType