If tests are testing functionalities and not implementation details, you could have the same outcome.
But lack of tests is also an alternative option. 😅
Well, 1) the refactoring included an API change, so I wasn't really safe and 2) it's about a new, experimental feature, so that's my excuse for not having thought of all the gazillion edge cases yet ;)
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But lack of tests is also an alternative option. 😅