Interesting point, it's not something I thought of. One solution as mentioned
by Simão, and what I had in mind, is to pull the type from the first parameter
of the function. We know that the function is always going to have minumum 1
parameter, and the value is always passed as the first argument.
One downside is that it isn't very transparent to the user - they might not
understand that the type is being taken from the first argument of the
function, and wonder where it is coming from, in which case, the other solution
would be to do something like `InitVar` but that takes two types (the return
and the init type); something like `var: InitFn[int, str]` for the `chr`
example.
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