I am working through the Gleam Exercism track and the Pizza Pricing example states that "ExtraSauce and ExtraToppings should wrap the Pizza type." Is there any documentation about what the syntax and/or design pattern of one type "wrapping" another looks like in Gleam? I am having trouble finding anything concrete by searching Google or Discord (other than this discussion thread: https://github.com/gleam-lang/gleam/discussions/1398).
Thanks in advance!

