simplify setKey logic for yargs-parser 75 #1
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Also removed arrow function to maintain compatibility with Node 0.10 (we're aiming to drop Node 0.10 support in early 2017).
Dropping the unnecessary
throw new Error('this should not happen')
statements also gets this back to 100% test coverage.If you don't see any problems with this, let's "Rebase and merge" this into your branch, and then we should be able to "Squash and merge" yargs#75.
Thanks for the new tests and working through this messy logic!