Hi all,

I'm working on adding reductions for the recently added relative indexing 
methods (String#at, Array#at, TypedArray#at). I've created a lowering for 
String#at successfully but I'm not sure what to do for Array#at and 
TypedArray#at. If I understand correctly, they need to handle all the 
different ElementKinds and ExternalArrayTypes and then emit loads to the 
underlying fixedarray or buffer based on that, but I'm not quite sure how 
to go about that. I'd also like to provide a fast path for 
`Array.prototype.at.call(array-like, index)`, but I'm not sure how to emit 
the generic property loads from the js call reducer.

Thanks

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