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A page with a side longer than 14,400 pt (200 in, ISO 32000-1 Annex C.2) keeps its size only with a UserUnit, which PDF 1.6 added. Exports now report such pages and handle the versions without a UserUnit: - Each such page adds a warning with its size and its UserUnit. Apps that ignore UserUnit show the page that many times smaller. - A PDF 1.5 file with such a page is written as PDF 1.6, with a warning. - PDF 1.3 and 1.4 files, PDF/X-1a and PDF/X-3 among them, are refused with an error that names the page and the limit, instead of "PDF writer error: Limit(TooLargeFloat)". - PDF/X-4 files at PDF 1.5 or 1.6 keep the page in points, with a warning that apps that keep to the limit cut it to 200 in. The warnings and the error have rows in every complete catalog. Docs: docs/mcp.md, docs/target-app-parity.md and the document.exportPdf params.