[Tagging] 'Unknown' value.

OSMDoudou 19b350d2-b1b3-4edb-ad96-288ea1238eee at gmx.com
Sun Feb 4 11:44:05 UTC 2018

Others already gave possible causes, so I won't add or repeat.

It's pointless tagging and leaves us guessing whatever it could mean.

If your analysis shows these tags don't add value (this is to say: don't make a gigantic update on places you haven't reviewed), you better remove them (possibly with a comment on the changeset explaining you're removing tags which don't make sense).

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