I'm happy to see Elixir adopting FP concept here ([identity
function](https://en.wikipedia.org/wiki/Identity_function)), but I'm not
sure it's good to add it to `Kernel` (as it's imported by default!) - or
even in Elixir core.
Why should we add this to Elixir core, instead of "extending" with module?
```elixir
defmodule FP do
def identity(a), do: a
end
def module YourApp do
import FP
def hello do
'abcdaabccc' |> Enum.sort |> Enum.chunk_by(&identity/1)
end
end
```
For example, that library can be de-facto helper for such FP utility
functions.
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