Hi, List.starts_with?/2 have recently been introduced
https://github.com/elixir-lang/elixir/pull/5789

I was working on improving the specs and the code,
and I have realized there are a few issues I would to work on.

Initially would like to to know whether we should support improper lists, that 
would determine how
the code can be optimized.

I would say yes, we should support improper lists.
But we also need to keep in mind that we will probably will end up adding 
List.ends_with?/2 too,
so we need to keep that in mind

If we support improper lists, prefix could be any term, not just a list.

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