
In recent work, Ioanna Dimitriou expanded JSON parsing test coverage in the tc39/test262 repository, focusing on scenarios involving JSON.parse with source, reviver behavior, and the JSON.rawJSON feature. She developed new test files in JavaScript to strengthen conformance checks and improve CI reliability. Later, in the oven-sh/WebKit repository, she stabilized cross-architecture WebAssembly JIT behavior on 32-bit systems by aligning i31 handling and enhancing IR generation with improved SIMD tracking using C++ and WebAssembly. Additionally, she addressed exception handling reliability in WebKit by ensuring accurate origin tracking, adding regression tests, and improving debugging for WebAssembly exception flows.

In September 2025, delivered a critical reliability fix for WebKit's WebAssembly exception handling when wasmOMGOptimizationLevel is disabled, ensuring PCToOriginMap is populated for correct origin tracking. Implemented the fix, added regression tests, and linked the work to bug 298651. This reduces crash risk and improves debugging/tracing for WebAssembly in user flows.
In September 2025, delivered a critical reliability fix for WebKit's WebAssembly exception handling when wasmOMGOptimizationLevel is disabled, ensuring PCToOriginMap is populated for correct origin tracking. Implemented the fix, added regression tests, and linked the work to bug 298651. This reduces crash risk and improves debugging/tracing for WebAssembly in user flows.
June 2025 monthly wrap-up for oven-sh/WebKit focusing on cross-architecture WebAssembly JIT stability on 32-bit. Delivered stabilization of i31 handling across tiers, aligned 32-bit behavior with 64-bit, re-enabled a previously failing test, and enhanced the 32/64-bit IR generator with improved SIMD tracking and debugging information, driving cross-arch reliability and test confidence.
June 2025 monthly wrap-up for oven-sh/WebKit focusing on cross-architecture WebAssembly JIT stability on 32-bit. Delivered stabilization of i31 handling across tiers, aligned 32-bit behavior with 64-bit, re-enabled a previously failing test, and enhanced the 32/64-bit IR generator with improved SIMD tracking and debugging information, driving cross-arch reliability and test confidence.
November 2024 (2024-11) monthly summary for tc39/test262 focused on expanding JSON parsing test coverage and migrating staging tests. Delivered new test coverage for JSON.parse with source, including reviver behavior and JSON.rawJSON; this work strengthens conformance checks and CI feedback for the JSON parsing surface. No major bugs fixed this month; primary value came from quality and reliability improvements.
November 2024 (2024-11) monthly summary for tc39/test262 focused on expanding JSON parsing test coverage and migrating staging tests. Delivered new test coverage for JSON.parse with source, including reviver behavior and JSON.rawJSON; this work strengthens conformance checks and CI feedback for the JSON parsing surface. No major bugs fixed this month; primary value came from quality and reliability improvements.
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