You're seeing just the function dump_to_native, go back to Ash.Type module for more information.
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dump_to_native(type, term, constraints \\ [])

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dump_to_native(t(), term(), constraints() | nil) ::
  {:ok, term()} | {:error, keyword()} | :error

Casts a value from the Elixir type to a value that the data store can persist

Maps to Ecto.Type.dump/2