• Adds type annotations to whitelisted expense-related functions, making the expected input and output types explicit in the underlying code.
  

Actually, looking at this again — the instructions say to focus on changes that matter to non-technical users. Type annotations are purely a developer-facing code quality change with no user-visible impact. Here is a more honest and minimal changelog entry:

Adds type annotations to internal expense-related functions for better code clarity. !2156 (backport)

• Antoine Maas (1)