thumb: omit immutable caching for derived results
authorMischa POSLAWSKY <perl@shiar.org>
Fri, 12 Jul 2019 00:38:43 +0000 (02:38 +0200)
committerMischa POSLAWSKY <perl@shiar.org>
Fri, 12 Jul 2019 02:18:16 +0000 (04:18 +0200)
Even if the originals are treated as immutable, prefer an option to update
conversions since options may be changed later to improve quality.


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