chore: finalize traverse fix — mapWithIndex, regression test, tooling alignment#4
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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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Builds on the merged traverse fix (#2 by @Renegatto) to fully close out the Array
traverse/mapWithIndexbugs and bring the fork to the canonical tooling.mapWithIndex (0-based).
mapWithIndexArraypassed the 1-based Lua loop index tof, but PureScriptmapWithIndexis 0-based — sofsawiinstead ofi - 1. Fixed (originally reported in #1 by @sarahnya).Regression suite.
test-regression/(run byscripts/test) covers:traverseoverMaybeis length- and order-preserving at sizes 0–8 (sizes > 3 exercise the divide-and-conquer pivot branch — the one that appends sub-results, which only works with the Array Semigroup fix shipped inpreludev7.2.2),traverseover the Array applicative, and 0-basedmapWithIndex. Verified green on Lua 5.1.Tooling alignment. purescript-overlay dev shell pinned to Lua 5.1 (drops easy-purescript-nix and its EOL/insecure nodejs, so plain
nix developevaluates), canonical nix CI replacing the inherited bower workflow, fail-fastscripts/build/scripts/test, and the package set bumped topsc-0.15.15-20260614(which carriespreludev7.2.2). Supersedes the earlier tooling-normalization PR #3.Closes #1.