PDF export and .ai saves wrote every page in points. ISO 32000-1
(Annex C.2) gives 14,400 units as the longest page side, and a page
with a longer side got a media box past that limit. A PDF/A-2b file
with such a page failed veraPDF's page size rule (6.1.13).
Such a page now gets a UserUnit (PDF 1.6): its longer side divided by
14,400 and rounded up to the next thousandth, with the page's sizes
and coordinates in those units. A 20,000 × 10,000 pt artboard is
written as a 14,398.85 × 7,199.42 page with /UserUnit 1.389, and
VectorCraft's PDF import reads it back at 20,000 × 10,000 pt. Pages
up to 14,400 pt, PDF 1.3 to 1.5 files, PDF/X files and printing are
written as before.
Docs: docs/mcp.md, docs/target-app-parity.md.
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