Sorry for not updating the OP, but it was a bit busy yesterday. Thanks for linking it. I also did not see the fix yet.

It might become production data and so I did not want to "reinvent the wheel" but stick to existing modules. The "experimental" warnings scared me a bit, but looking at the code, I think It could be rewritten as:

given(something) -> SWITCH: for(something)
when(/test/)     -> /test/ && do {
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