[Proposal] Add Tuple.replace_at

[Rudolf Manusadzhian]

Hi there. Recently I faced the situation where I wanted to "replace" the element of a tuple that was created dynamically from a list with the length defined at runtime.

While I found :erlang.setelement(index, tuple, value) does what I need, its arguments order and 1-based indexes are not that natural to elixir.

So I would propose to add a wrapper around :erlang.setelement/3 to Tuple module. (I called it replace_at just because I was looking for the analogy of List.replace_at but for tuple)

I put together quickly a commit of how it could be implemented https://github.com/elixir-lang/elixir/commit/6e498edaf257e3fccf15bc5243c3ccf2d67e6e85

[Andrey Yugai]

Hi Rudolf. Elixir actually has such wrapper already, and what's more cool about it, it's implemented exactly how you suggested:

https://github.com/elixir-lang/elixir/blob/a64d42f5d3cb6c32752af9d3312897e8cd5bb7ec/lib/elixir/lib/kernel.ex#L1724

Other tuple related functions are mentioned at the top of Tuple module docs.

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[Rudolf Manusadzhian]

Wow, awesome! Thank you, Andrey!