Exgencode.Pdu.set_offsets

You're seeing just the function set_offsets, go back to Exgencode.Pdu module for more information.
Link to this function

set_offsets(pdu, version \\ nil)

Specs

set_offsets(Exgencode.pdu(), nil | Version.version()) :: Exgencode.pdu()

Set the values of all offset fields. If no fields have the :offset_to property it become an identity function