attribute resolver script

[Christopher Bongaarts]

On 11/22/2016 5:15 PM, Cantor, Scott wrote:
> It couldn't do anything else since it wouldn't make sense. If you matched X and Y and both were in the input set, how could it know what to output if the expectation was only a single value?

First match wins?

I could see a use for a "single-output" Mapped type with that sort of 
semantic...

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