update

phoenix/deps/jason/lib/fragment.ex

@@ -0,0 +1,21 @@
+defmodule Jason.Fragment do
+  @moduledoc ~S"""
+  Provides a way to inject an already-encoded JSON structure into a
+  to-be-encoded structure in optimized fashion.
+
+  This avoids a decoding/encoding round-trip for the subpart.
+
+  This feature can be used for caching parts of the JSON, or delegating
+  the generation of the JSON to a third-party system (e.g. Postgres).
+  """
+
+  defstruct [:encode]
+
+  def new(iodata) when is_list(iodata) or is_binary(iodata) do
+    %__MODULE__{encode: fn _ -> iodata end}
+  end
+
+  def new(encode) when is_function(encode, 1) do
+    %__MODULE__{encode: encode}
+  end
+end