Use update_at instead of replace_at

Author: corka149

lib/jsonpatch/operation/add.ex

@@ -56,7 +56,7 @@ defmodule Jsonpatch.Operation.Add do
             if last_fragment == "-" or length(final_destination) == index do
               Enum.concat(final_destination, [value])
             else
-              List.update_at(final_destination, index, fn _ -> value end)
+              List.replace_at(final_destination, index, value)
             end
 
           PathUtil.update_final_destination(

lib/jsonpatch/operation/copy.ex

@@ -98,7 +98,7 @@ defmodule Jsonpatch.Operation.Copy do
 
           {index, _} ->
             if index < length(copy_target) do
-              List.update_at(copy_target, index, fn _old -> copied_value end)
+              List.replace_at(copy_target, index, copied_value)
             else
               {:error, :invalid_index, copy_path_end}
             end