During July 2025, W worked on the oasisprotocol/oasis-sdk repository, focusing on improving quantity handling in TypeScript. They addressed a bug in ts-web/core by implementing stricter input validation for BigInt values, ensuring that negative values are rejected when converting to quantities. This change throws a RangeError for invalid input, preventing downstream errors in transaction processing and enforcing non-negative quantity representations. W’s work involved careful BigInt manipulation and robust error handling, resulting in improved test coverage and greater runtime stability. The update enhanced reliability for developers and users interacting with the SDK, reflecting a thoughtful approach to defensive TypeScript development.