To ensure all the referenced records are retained.
Without this, sanitizing the ARIALBD.ttf file referenced at https://bugzilla.mozilla.org/show_bug.cgi?id=1761233#c25 (apparently from the old MS Core Fonts, but may have been modified?) generates a bad result, because numRecs in the font is 1, but in fact there are 4 records, and offsets pointing to them, so we need them all to be preserved.
(Also consistently prefer Drop() to Error() when parsing VDMX, as the font should still be functional without it.)
To ensure all the referenced records are retained.
Without this, sanitizing the ARIALBD.ttf file referenced at https://bugzilla.mozilla.org/show_bug.cgi?id=1761233#c25 (apparently from the old MS Core Fonts, but may have been modified?) generates a bad result, because numRecs in the font is 1, but in fact there are 4 records, and offsets pointing to them, so we need them all to be preserved.
(Also consistently prefer Drop() to Error() when parsing VDMX, as the font should still be functional without it.)