Worked on the AvaloniaUI/Avalonia repository to address a stability issue in UI Automation by fixing a crash related to ComVariant marshalling of decimal types. The solution involved overlaying a decimal field within the ComVariant structure and aligning the marshalling logic with the Base Class Library approach, ensuring the VT_DECIMAL discriminator was correctly handled during both write and read operations. This change prevented unhandled exceptions when controls like NumericUpDown raised automation property-changed events with decimal values. Demonstrated expertise in C#, memory management, and Windows interop, resulting in improved accessibility reliability and more robust automation workflows across different environments.