Worked on the micronaut-serialization repository to address a critical issue in BSON and JSON number handling, focusing on ensuring accurate serialization and deserialization of numeric types. Using Groovy and Java, the developer fixed a bug that previously caused loss of number type fidelity, particularly with BigInteger values, by refining both the serialization logic and fallback deserialization for custom number implementations. The work included correcting an element index increment bug to prevent data misalignment in serialized streams. Through targeted testing and improvements in BSON serialization, the module now provides more robust, type-aware data interchange for consumers and downstream services relying on serialization.