[Repo Assist] Add AsyncSeq.findIndex, tryFindIndex, findIndexAsync, tryFindIndexAsync, sortWith#261
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…nc, sortWith Five new combinators mirroring standard F# module functions: - findIndex: returns 0-based index of first matching element; raises KeyNotFoundException if not found (mirrors Seq.findIndex) - tryFindIndex: returns Some index for first matching element, or None (mirrors Seq.tryFindIndex) - findIndexAsync: async-predicate variant of findIndex; raises KeyNotFoundException if not found - tryFindIndexAsync: async-predicate variant of tryFindIndex; returns option - sortWith: sorts sequence using custom comparison function, returning array (mirrors Seq.sortWith) 12 new tests added; 279 total pass. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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Summary
Adds five new combinators to
AsyncSeq, filling gaps relative to the standardSeqmodule:findIndexKeyNotFoundExceptionif not foundSeq.findIndextryFindIndexSome indexof first matching element, orNoneSeq.tryFindIndexfindIndexAsyncfindIndex; raisesKeyNotFoundExceptionif not foundtryFindIndexAsynctryFindIndex; returnsoptionsortWithSeq.sortWithImplementation Notes
tryFindIndex/tryFindIndexAsyncare implemented with directuse ie = source.GetEnumerator()loops (same pattern astryItem) to avoid a forward-reference toindexed.sortWithreuses the existingtoSortedSeqhelper used bysort,sortBy, etc.findIndex/tryFindIndexisint(matchingSeq.findIndex) notint64.Test Status
Build: ✅ succeeded (0 errors, 1 pre-existing warning on
groupByAsync)Tests: ✅ 279/279 passed (267 before + 12 new)
Closes #none (standalone improvement)