BoundFunc bound parameters can be accessed via __Item()

[iseahound]

It wasn't obvious to me that one could recover parameters in bound funcs.

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k := (x) => (y) => x  ; k(x, y) takes 2 arguments.
k5 := k(5)            ; k5 is a partially applied function.
MsgBox k5[1]          ; Recovers the bound argument.

https://lexikos.github.io/v2/docs/objects/Functor.htm#BoundFunc

[swagfag]

well, u cant actually. i found it kinda sus that @lexikos wouldnt document such a feature, so i went to check in the source and in fact there isnt such a feature
Func[] simply invokes the function(the same way Func() would, assuming __Item hasnt been defined)

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#Requires AutoHotkey v2.0-a128-f63b0eb4
MsgBox['helloworld']

so indexing into ur boundfunc doesnt recover anything, ure simply supplying the remaining parameter, calling it, yielding whatever u passed in as the first argument and discarding the second(which is a byproduct of the way uve designed the function)

[lexikos]

That's not intentional, and it only does it if there are no own properties defined.