[Python] Fix missing Array module implementations and tests

[ncave]

• [Beam] Fix List.Cons call replacement and test
• [Beam/Dart/Python/TypeScript] Fix Array.Equals to use reference equality instead of structural equality
• [Dart/Python/TypeScript/Rust] Fix Seq.foldBack2 for sequences with different lengths
• [Python] Fix missing Array module implementations and tests

[Copilot]

Pull request overview

This PR updates Fable compiler replacements and runtime libraries to close gaps in Array/Seq behavior across targets (notably Python) and aligns tests accordingly, including fixes for Array.Equals reference equality and Seq.foldBack2 on uneven sequences.

Changes:

• Fix Seq.foldBack2 to fold over the shorter sequence (TS/Dart/Python/Rust libraries) and update tests to cover uneven inputs.
• Change Array.Equals/Object.Equals lowering to use reference equality for arrays (Dart/Python/TS compiler transforms) and add tests asserting the expected behavior.
• Add missing Python Array runtime implementations (e.g., fold2, exists2, for_all2, iterate2, unzip3, zip3, all_pairs, descending sorts, where, exactly_one) plus expanded test coverage; also add Beam List.Cons replacement and tests.

Reviewed changes

Copilot reviewed 26 out of 26 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
tests/Rust/tests/src/SeqTests.fs	Adjust Seq length tests and cover uneven fold2/foldBack2 inputs.
tests/Rust/tests/src/HashSetTests.fs	Rename helper to hashSet and clean up variable naming in tests/comments.
tests/Python/TestSeq.fs	Expand Seq tests (length variants, equality/Equals, fold2/foldBack2, permute, replicate).
tests/Python/TestHashSet.fs	Rename helper to hashSet and improve local variable naming.
tests/Python/TestArray.fs	Add extensive Array behavior tests (equality vs Equals, indexing, ConvertAll, distinct*, exists2, where, fold2, iter2/iteri*, sorting desc, unzip3/zip3, allPairs, exactlyOne/tryExactlyOne).
tests/Js/Main/SeqTests.fs	Expand Seq tests (length variants, fold2/foldBack2, sortWith).
tests/Js/Main/HashSetTests.fs	Rename helper to hashSet and improve local variable naming.
tests/Js/Main/ArrayTests.fs	Add array equality/Equals/comparison/indexing tests and more Array API coverage.
tests/Dart/src/SeqTests.fs	Expand Seq tests (length variants, fold2/foldBack2, sortWith).
tests/Dart/src/HashSetTests.fs	Improve local variable naming in tests/comments.
tests/Dart/src/ArrayTests.fs	Add array equality/Equals/comparison/indexing tests and enable Array.splitAt test.
tests/Beam/SeqTests.fs	Expand Seq length tests and cover uneven fold2/foldBack2 inputs.
tests/Beam/ListTests.fs	Add tests for List.empty and List.Cons.
src/Fable.Transforms/Replacements.fs	For TS/JS transforms, make Object.Equals use reference equality when the receiver is an array.
src/Fable.Transforms/Python/Replacements.fs	Make array Equals use strict reference equality; add ConvertAll lowering for Python.
src/Fable.Transforms/Dart/Replacements.fs	Make Object.Equals use reference equality when the receiver is an array (Dart).
src/Fable.Transforms/Beam/Replacements.fs	Implement List.Cons replacement for Beam.
src/Fable.Compiler/CHANGELOG.md	Document the fixes in compiler changelog.
src/Fable.Cli/CHANGELOG.md	Document the fixes in CLI changelog.
src/fable-library-ts/Seq.fs	Fix Seq.foldBack2 to fold to the shorter length.
src/fable-library-rust/src/Seq.fs	Fix Seq.foldBack2 to fold to the shorter length.
src/fable-library-py/src/array.rs	Add missing Python Array module functions and register them.
src/fable-library-py/fable_library/Seq.fs	Fix Seq.foldBack2 to fold to the shorter length.
src/fable-library-py/fable_library/core/array.pyi	Extend Python typing stubs for newly added Array APIs.
src/fable-library-py/fable_library/array_.py	Re-export expanded Array APIs from the Python core module.
src/fable-library-dart/Seq.fs	Fix Seq.foldBack2 to fold to the shorter length.

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[Copilot]

Pull request overview

Copilot reviewed 26 out of 26 changed files in this pull request and generated 3 comments.

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Pull request overview

Copilot reviewed 28 out of 28 changed files in this pull request and generated 1 comment.

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Pull request overview

Copilot reviewed 28 out of 28 changed files in this pull request and generated no new comments.

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[dbrattli]

Added a few comments, but looks really great. Thanks for fixing ❤️

[dbrattli]

Thanks for merging @ncave. Python now has more than 2300 unit-tests and Beam more than 2400. That is 200 more for each of them is just 2 weeks 😊 ... quickly approaching Fable JS v4 quality (2500) 😲