Nine findings, two of them decisions the implementation could not have
proceeded without, one a compliance error. Two rev-1 claims were wrong rather
than imprecise and are withdrawn where they occur.
F1, the fraction height budget, was hidden inside "a box that would exceed the
line" without saying width or height. Lines cannot grow — metrics are uniform
at 16 px over a 22 px line — and a textstyle fraction does not fit. Q#MS10 now
picks fit-to-line scaling with a 0.6x floor and source fallback below it,
records why overdraw and line growth were rejected, and states the honest
consequence: v0 shrinks nested math uniformly where TeX would use style
levels. B6 makes the floor falsifiable against the flagship case.
F3 was a genuine contradiction: acceptance 10 demanded source-width boxes
while Q#MS4 implied layout-chosen width, and that gap IS the caret-toggle
reflow question. Resolved for layout-chosen, because pinning to source width
leaves every fraction sitting in a large permanent gap, whereas reflow is
transient and tied to a deliberate caret move. Acceptance 10 is rewritten to
bound it rather than forbid it.
F2 withdrew the zero-glyph strut: a RichChunk's only width is its text, so the
mechanism is the SourceTab precedent — projected spacer text, width quantized
to whole advances. B1 is restated against the mechanism that exists.
F5 would have bitten real prose immediately: the rev-1 rule renders "prices
are $5 and $6 today" as math. Pandoc currency guards adopted, spans confined
to one line, both in acceptance.
F6 is factual and a licence matter. Latin Modern Math is the GUST Font
License, not OFL, and is 733,736 bytes rather than ~200 KB — verified against
a local TeX Live copy. The bundled licence file must say GFL, and this becomes
the largest embedded asset in the repo. The parent framing carries the same
error; correcting it is recorded as a follow-up rather than done here, since
the parent is already merged.
F4 names the new shaping-invalidation edge as the #120 trap class, including
that suppression must read the effective caret or flap during optimistic
typing. F7 puts math italic in scope, without which the flagship case renders
a roman x. F8 clarifies that glyph IDs are still resolved internally and that
drawing must pin Attrs to the math family. F9 closes the smaller gaps: the
detection hook wording, an overlay rule for selections and washes, degradation
of deferred display syntax, and folding Char/Symbol.
Framing only; no implementation, no runtime code.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Levi Neuwirth
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