Ecto.ParameterizedType.autogenerate

You're seeing just the callback autogenerate, go back to Ecto.ParameterizedType module for more information.
Link to this callback

autogenerate(params)

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Specs

autogenerate(params()) :: term()

Generates a loaded version of the data.

This is callback is invoked when a parameterized type is given to field with the :autogenerate flag.