The following two pages only different on an inivisible unicode character
the should point at the same page but they don't.
This causes a lot of interwiki bots to add invisible unicode characters (https://en.wikipedia.org/w/index.php?title=Paul_Val%C3%A9ry&diff=521762765&oldid=521723299)
The three characters that cause similar problems are \u200E|\uFEFF|\u200B
Version: 1.21.x
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=27446
https://bugzilla.wikimedia.org/show_bug.cgi?id=14600
https://bugzilla.wikimedia.org/show_bug.cgi?id=5732