Worked on the zarr-python repository to enhance asynchronous resource management for FsspecStore, focusing on robust cleanup of async filesystems during store closure. Addressed a persistent issue where unclosed sessions could lead to resource warnings and runtime instability, particularly in production and with newer Python runtimes. Introduced explicit ownership semantics using a dedicated flag to prevent resource leaks and double-closing scenarios, and expanded unit testing to cover various lifecycle and ownership patterns. Leveraged Python and asynchronous programming techniques to ensure reliable store shutdowns, while improving code hygiene and documentation for future maintainers. The work improved stability and compatibility in production deployments.