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How does this not fail when tested?

Or how do you start manipulating urls and not just realize this is inevitable / words have these strings inside them…?

By not having test cases for those specific domains, and by passing your input through some general purpose internal URL handling library that does more than you thought it did [1]. Neither is (very) surprising.

[1] https://rachelbythebay.com/w/2021/12/24/mkdir/

‘You know words have “co” in them’ seems like an easy thing to think of.

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