Further to Tim Stone's response to my bug report regarding what turned out to be an en dash in an URL: Would it be reasonable for markdown mini to replace en dashes with normal hyphens? Or is that Wikipedia article's URL just a fluke?
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No, that would be just wrong. We have, however, changed the handling of not-whitelisted characters in those URLs from "just remove" to "percent-encode", which obviously solves your original problem as well (and others), while not changing the URL – on Wikipedia, different dash kinds may be equivalent, but this probably is not the case everywhere.