[openstreetmap/openstreetmap-website] Whether to allow users to use easily confused characters such as "Zero-width Space" in their usernames. (Issue #4538)

[Tom Hughes]

What we could maybe do is to change the current requirement that the be at least 3 bytes long to a requirement that it have a unicode display width of 3 characters - there is a [gem](https://rubygems.org/gems/unicode-display_width) for getting that width.

That would at least prevent names made up entirely of invisible characters.

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