Flask will pick the first route that matches. Decorators get applied
from innermost to outermost.
So if the same endpoint is served at `/abc` and `/123` the one used
when `url_for` is generating a URL is whichever decorator is lowest
(in terms of line number).
It doesn’t functionally make a difference, but it’s causing the
functional tests to fail at the moment. And shorter URLs are nicer, so
I think it makes sense to change here, rather than change the tests.
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