Remove list guard in Plug.Conn.merge_assigns and merge_private

[hissssst]

Just a more flexible solution

[josevalim]

Can you please provide examples of use cases?

[hissssst]

I don't know why this limitation exists in the first place, I haven't found anything about this in original PR or commit messages

Here's an example from my codebase

static_assigns = static_assigns()
dynamic_assigns = 
  categories_assigns
  |> Map.merge(item_assigns)
  |> Map.merge(brands_assigns)
  |> Map.merge(overrides)
  |> Enum.to_list() # This is unnecessary

conn
|> merge_assigns(static_assigns)
|> merge_assigns(dynamic_assigns)

[whatyouhide]

I'm ok with a generic enumerable, but the Enumerable.t/1 type is a recent addition to Elixir. You'll have to use Enumerable.t() here. 🙃

[hissssst]

@whatyouhide @josevalim ping

[josevalim]

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