Ecto.ParameterizedType.load

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

load(value, loader, params)

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Specs

load(value :: any(), loader :: function(), params()) ::
  {:ok, value :: any()} | :error

Loads the given term into a ParameterizedType.

It receives a loader function in case the parameterized type is also a composite type. In order to load the inner type, the loader must be called with the inner type and the inner value as argument.

For more information on loading, see Ecto.Type.load/1. Note that this callback will be called when loading a nil value, unlike Ecto.Type.load/1.