Python -> TS type inference fails on array function arguments

[riknoll]

Reported here: https://forum.makecode.com/t/using-normal-python-in-makecode-but-its-not-working/25746 and here: https://stackoverflow.com/questions/76394372/what-does-e-findidx-is-not-a-function-mean-in-minecraft-makecode-python

When switching from python to ts, our type inference fails on functions that take array parameters. For example, this Python:

def whatever(val):
    val[0] = 0

whatever([1])

converts to this ts:

function whatever(val: any) {
    val[0] = 0
}

whatever([1])

Note that the parameter type is any, which confuses the compiler so that it emits code that tries to access the index as it would on an object and not on an array. This throws an exception in browser and on hardware.

[riknoll]

a workaround for this is to give a type hint in Python

def whatever(val: List[number]):
    val[0] = 0

whatever([1])

...though we should definitely fix this bug as most folks wouldn't think to do that