[openstreetmap/openstreetmap-website] Changeset tags exceed limit of 255 unicode codepoints (Issue #6350)

[Tom Hughes]

tomhughes left a comment (openstreetmap/openstreetmap-website#6350)

I may have missed a byte somewhere because rails actually thinks 255 is the length:

```ruby
open-street-map(dev)> ChangesetTag.find([167608541, "imagery_used"])
  ChangesetTag Load (15.0ms)  SELECT "changeset_tags".* FROM "changeset_tags" WHERE "changeset_tags"."changeset_id" = 167608541 AND "changeset_tags"."k" = 'imagery_used' LIMIT 1 /*application='OpenStreetMap'*/
=> 
#<ChangesetTag:0x00007f6178d59ec8
 changeset_id: 167608541,
 k: "imagery_used",
 v: "Bing Maps Aerial;GeoScribble latest notes;󠀠󠀠󠀠󠀠⚪ St...">
open-street-map(dev)> ChangesetTag.find([167608541, "imagery_used"]).v.length
  ChangesetTag Load (14.8ms)  SELECT "changeset_tags".* FROM "changeset_tags" WHERE "changeset_tags"."changeset_id" = 167608541 AND "changeset_tags"."k" = 'imagery_used' LIMIT 1 /*application='OpenStreetMap'*/
=> 255
```

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