> Not sure if I'm missing something, but wouldn't it be trivial to code that 
> constructor in JS?

Yes it would be trivial, but my design I came up with was an example. The point 
I wanted to get across was to have some sort of standard practice for error 
handling using `return` rather than `throw`, akin to how `Promise` gives us a 
standard design and encapsulation for asynchronous code.
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