Great kata!
It was an interesting problem to solve. At first I was bit confused with the description and examples, but I figured it out.

Great kata!

the problem is that there is no universal pseudo code syntax. if you make it Pythonic, JS users will be confused, and the other way around. when some language features are involved it is not always possible to make a description both language-agnostic and clear. the syntax and semantics of passing functions to other functions depends heavily on the language.

pseudo code, or english

What syntax do you propose for them?

I fear whatever we do people will complain that it isn't in precisely the singular language that they know.

The examples in description should be language agnostic.

this translation was rejected somewhere in the past 9 years.

both understandings are essentially correct.

you are to return the indices of the parameters that actually influence the function's result. this return value is uniquely determined by the input; there are no multiple possible return values.

closing.

Consider that may have been the point.

Consider also that you understood with no further elaboration.

so is your issue report. anyways, i added a couple of sentences to clarify things.

"pure" is not the same as "referentially transparent".

Description is extremely opaque

this solution no longer passes the tests