Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
cd445dce76
This PR removes the `Subarray`-specific `toArray`, `foldlM` and `foldl` methods and instead provides these operations on `Std.Slice`, which are implemented with the `ToIterator` instance of the slice. Calling `subarray.toArray` etc. still works, since `Subarray` is an abbreviation for `Slice _`. Because the benchmarks are not so clear, to be safe, I will merge this only after the release. In contrast to the ranges, the iteration over slices is not quite as efficient as the old `Subarray`-specific implementation, which would require either more optimizations in the iterator library (special `IteratorLoop` and `IteratorCollect` implementations) or better unboxing support by the compiler. |
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