The check that a PDF/X-1a or PDF/X-3 file has no transparency read names
in literal strings and comments as syntax. The file identifier is a
base64 hash of the file, so a file could now and then hold `/BM` or
`/Lab` there and its export was refused as having blend modes or Lab
colors. The check now leaves out the text of literal strings and
comments as well as stream data.
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a07cdf87f0