Consider consolidation with https://ryanjk5.github.io/posts/rjk-duck/

[jbcoe]

Review and possibly use reflection-based implementation in https://ryanjk5.github.io/posts/rjk-duck/

PAIR=@RyanJK5

[jbcoe]

Agent-driven prototype at: #95 looks promising.

This needs significant review before we are happy merging it.