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A w:num can redefine any of its abstract list's levels with a whole
w:lvl inside w:lvlOverride. We kept only the start value from it and
numbered with the abstract list's levels, so documents that rely on it
showed the wrong labels: a construction specification (SpecLink) read
"A. PART 1 GENERAL" and "I. SECTION INCLUDES" where Word shows "PART 1
GENERAL" and "1.01 SECTION INCLUDES". Saving such a document also
dropped the definitions, so Word showed the wrong labels afterwards.
Num::level_overrides keeps them; Numbering::level and the list counters
prefer them over the abstract list's levels; the .docx reader reads them
with the abstract levels' parser and the writer writes them back (one
w:lvlOverride per level with its startOverride and/or lvl).
In docxide-pdf's Word reference corpus 6 of 382 documents carry such
definitions; the specification's SSIM goes 13% -> 41%, the others
restate their abstract lists and are unchanged.
Tests: counters use a list's own levels ("" and "%2.%3" in decimalZero
give "1.01", "1.02", "2.01") and fall back to the abstract list for the
rest; level overrides round-trip through .docx beside start overrides.
Co-authored-by: Oliver Zieschang <4963183+naxvog@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>