PassiveSupport.Map.stringify_keys
You're seeing just the function
stringify_keys, go back to PassiveSupport.Map module for more information.
Link to this function
stringify_keys(map)
Returns a version of map whose keys have all been
converted to strings.
Examples
iex> stringify_keys(%{7 => 8, "hey" => "ha", hi: "ho"})
%{"7" => 8, "hey" => "ha", "hi" => "ho"}