Fix typedoc API rendering

Our typedoc page is having trouble displaying the API for pages like "Contract" due to a complex typing issue. To illustrate, here's an example page: https://crossbell.js.org/classes/index.contracts.CharacterContract.html (the page may crash as it is attempting to render too many long types for the `overrides` parameters with low performance). 

Searching for a solution to this issue.
