William F Pokorny <ano### [at] anonymousorg> wrote:
>
> which highlights another kind of trap! Namely, using z,y,z,u or v
> internal to a function body where you've not specified them in the
> argument list. Looks like those all default to 0 and the variables are
> available within the function body without complaint from the parser
> whether they are getting set by some explicit (or defaulted) argument
> passing or not. The 'not' case being the exposure.

I just discovered this last night.  See Mysterious function argument in
p.documentation.inbuilt.

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