Strawman: `Function.prototype.try` (or `Function.try`)

[dante federici]

There exist lots of libraries that give this sort of functionality among
others in the functional community -- lots of Either or Maybe
implementations.

I don't think this is a healthy addition to the spec since you would then
want to consider all the other monadic goodies like mapping over these
values, folding, "all" and "some", etc.
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