I like `Enum.one/1`. Agree that it's confusing to have `take/1` return a
single element and `take/2` returning a list, although Rails' `take` works
like this.
If the collection is empty it returns nil naturally. A bang and non-bang
version could work, this would make it work like Ecto's `one/2`
"Sins of the father." - I prefer consistency to having `take` return two
different result types.
I think that `Enum.one\2` is a much better idea. I expect the second
argument to default to nil and allow a default to be passed in.
There is a difference between verbose and explicit. Ruby's each is
