During November 2024, Ning contributed to the paritytech/polkadot-sdk repository by extending the TypeWithDefault utility to support a wider range of integer types, including u8 through u128. This work involved enhancing Rust macros and type system logic to ensure safe and configurable runtime defaults, directly addressing a compile-time compatibility issue with the BaseArithmetic trait that previously complicated replay-attack prevention workflows. Ning’s focused engineering improved runtime development by reducing integration friction and broadening the applicability of TypeWithDefault across various configurations. The contribution demonstrated depth in Rust runtime development and type system expertise, delivering a robust solution to a nuanced problem.