v0.15.2

0.15.2 (2026-11-02)

This release fixes two results that broke what the headers promise. An Oklab or OkLCh color far past its ends keeps each channel's sign (#227), and mtwnIsEasingMonotonic no longer approves a linear() easing whose halves step down where in-out or out-in joins them, so a timeline refuses it (#230). Values change only for colors driven past about 5.6e102 in Oklab or OkLCh; nothing within range moves. Each fix below names who sees it.

Changed

• The easing and values guides say when linear() is monotonic in in-out and out-in, and that a color channel past the floats' range is held at the largest finite float of its sign in every space.

Fixed

• An Oklab or OkLCh color whose coordinates pass about 5.6e102 has each channel at the largest finite float of its own sign, as the headers promise, in mtwnMixColor, color transitions, color tracks and mtwnConvertColorFromSpace (#227). A channel whose sum met infinities of both signs was held at +FLT_MAX: black to white at a progress of -1e110 gave +FLT_MAX in each channel, brighter than white, where sRGB gives -FLT_MAX. Oklab is the default space of transitions and tracks.
  • A host that drives a color that far, with a back overshoot past about 1e100 or a linear() output past the doubles' range for example, sees the corrected sign.
  • An OkLCh color so far out that its hue passes the doubles (a progress past about 1e307) takes a hue of 0, as a missing hue does, where its channels were held at +FLT_MAX.
  • Nothing within range moves: 800,000 mixes and conversions in every space and hue method give the same bits as 0.15.1.
• mtwnIsEasingMonotonic returns false for linear() in in-out ending above 1, or in out-in starting below 0, where it returned true (#230). Those modes join the curve's halves at 1/2, and such an easing steps down there: linear(0, 2) in in-out gives 1 just below 1/2 and 0 at it. mtwnClip_AddTimeline took a timeline eased so, and its marks could be counted twice, or trap in a build with assertions.
  • mtwnClip_AddTimeline now refuses such a timeline with mtwn_errorInvalid. A host that eased a timeline so sees the refusal.
  • Every other easing keeps its verdict, and no value, velocity or event record of an accepted clip changes.