What technical objections and independent re-implementations of APCA are recorded in the W3C wcag3 issue tracker?

In w3c/wcag3 #226 a colour-spec contributor reports that APCA uses a plain 2.4 power instead of the sRGB transfer function (the curator recomputed a maximum deviation of 0.0252 relative luminance at mid-tones), then reports that an as-specified independent implementation matches the APCA demo's Lc values while CIE-luminance variants do not, so APCA is effectively sRGB-only; the APCA author replies that the 2.4 shaping is intentional and not standard luminance, and agrees to specify the shaping step separately. Curator qualifications: Pages/code read 2026-10-22; nothing streamed, emulated or rendered. Reproduction of Lc values is the implementer's report (comment 2583269331, 2022-06-22; read in comments JSON fc48ec518036cee4), not curator-executed. Issues 212, 221 and 29 (S14-S16) not re-read; no controlled readability study found there (producer). Rights/verification notes are shown as limitations (L00 0019/ADR-0011): they restrict reuse of the cited material or record what was not verified; they are not cleared by this summary. Limitations: Pages/code read 2026-10-22; nothing streamed, emulated or rendered. [rights_conflict_record] Eligible with conflict; T17.03 (APCA scores are sRGB-specific; not a CIE-luminance metric). Evidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.

{
  "citations": [
    {
      "url": "https://github.com/w3c/wcag3/issues/226",
      "note": "w3c/wcag3 issue 226 body (GitHub API GET; bytes equal pin), opened 2022-06-16; curator recomputation from the sRGB piecewise EOTF (no source bytes)"
    },
    {
      "url": "https://github.com/w3c/wcag3/issues/212",
      "note": "w3c/wcag3 issue 226 body (GitHub API GET; bytes equal pin), opened 2022-06-16; curator recomputation from the sRGB piecewise EOTF (no source bytes)"
    },
    {
      "url": "https://github.com/w3c/wcag3/issues/221",
      "note": "w3c/wcag3 issue 226 body (GitHub API GET; bytes equal pin), opened 2022-06-16; curator recomputation from the sRGB piecewise EOTF (no source bytes)"
    },
    {
      "url": "https://github.com/w3c/wcag3/issues/29",
      "note": "w3c/wcag3 issue 226 body (GitHub API GET; bytes equal pin), opened 2022-06-16; curator recomputation from the sRGB piecewise EOTF (no source bytes)"
    }
  ]
}