Worked on the microsoft/kiota-python repository to address a critical issue in JSON parsing, focusing on improving data integrity for API clients. Using Python, the developer identified and fixed a bug where numeric strings were mistakenly parsed as dates, which could lead to downstream data errors. The solution involved implementing a pre-parse validation step that distinguishes between numeric strings and date-like values, ensuring that digit-only strings remain as strings during parsing. This targeted fix enhanced the reliability of the SDK’s data handling without introducing new features, and was supported by unit testing to maintain code quality and prevent future parsing regressions.