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The --uncache option to the lvconvert command is not specifically documented in the manual, although it's in the man page. This BZ is a note to discuss whether this should go into the manual (too late for 7.3 GA but we can get it in at any time).
The LVM manual refers to the lvmcache(7) man page for further administrative examples, and an example of this parameter is documented there, so I'm closing this out as notabug.