Fix traverse failing at runtime#2
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Traverse used JS implementation which is OK except that the array indexing was starting from 0.
Unisay
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Jun 14, 2026
Follows the merged traverse fix (#2 by @Renegatto). On top of it: - Fix mapWithIndexArray: it passed the 1-based Lua loop index to f, but PureScript mapWithIndex is 0-based, so f received i instead of i-1 (originally reported in #1 by @sarahnya). - Add a focused regression suite (test-regression/) run by scripts/test: traverse over Maybe is length/order-preserving at every size (>3 hits the pivot/append branch, which needs the Array Semigroup fix shipped in prelude v7.2.2), traverse over the Array applicative, and 0-based mapWithIndex. - Align tooling: purescript-overlay dev shell on Lua 5.1 (drops easy-ps / insecure nodejs), canonical nix CI replacing the bower workflow, fail-fast scripts, and bump the package set to psc-0.15.15-20260614 (prelude v7.2.2). Supersedes the earlier normalization PR #3. Closes #1
This was referenced Jun 14, 2026
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Description of the change
traverseis failing at runtime due to 2 reasons:table.concatfor array concatenation, which does not do that.This PR fixes both.
Checklist:
Added the change to the changelog's "Unreleased" section with a reference to this PR (e.g. "- Made a change (#0000)")