Thoughts
In this code we need a function that returns its value unchanged. Lodash has a helper that does this, called _.identity. So we can just do:
`(v) => _.identity(v);`
This is so funny to me. To explain the joke, the point of the helper is that you don't have to create an arrow function (point-free programming), you can just use `_.identity`. Instead, the person writing this code created an arrow function that calls `_.identity`. If you're going to create an arrow function, just return `v`.