Worked on improving the Deno KV API within the denoland/deno repository by exposing public fields in PermissionDeniedError and deno_kv::KvConfig, streamlining the instantiation process for developers. This internal API refinement, implemented in Rust with a focus on system programming, eliminated the need for unsafe memory transmutes in common initialization paths, thereby enhancing safety and reducing boilerplate code. The changes did not alter runtime behavior but clarified API contracts, making integration easier for Deno KV users. By aligning the API surface with internal ergonomics goals, the work accelerated developer experience and reduced maintenance overhead for future contributors and users.