Ecto.ParameterizedType.embed_as

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

embed_as(format, params)

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Specs

embed_as(format :: atom(), params()) :: :self | :dump

Dictates how the type should be treated inside embeds.

For more information on embedding, see Ecto.Type.embed_as/1