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"Key contains invalid characters" for parser cache
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Description

Seen in Logstash for various page views of File-namespace pages with a custom uselang query parameter. It seems this is bypassing the makeKey() logic for that backend.

Exception from line 156 of /srv/mediawiki/php-1.30.0-wmf.4/includes/libs/objectcache/MemcachedBagOStuff.php: Key contains invalid characters: commonswiki:pcache:idhash:19264588-0!userlang=⧼lang⧽