Learn about three proposed Git enhancement patch series that require careful consideration due to potential backwards compatibility issues in this 18-minute conference talk from the Linux Foundation's Open Source Summit. Explore the history, motivation, design alternatives, trade-offs, and risks associated with submodule path encoding to prevent repository conflicts, extended Git hooks specified through configurations, and parallel hook execution capabilities. Understand the technical challenges involved in extending Git's functionality while maintaining system stability and backwards compatibility through detailed analysis of each proposed enhancement.