Workers - Improved memory efficiency for WebAssembly Workers

FinalizationRegistry is now available in Workers. You can opt-in using the enable_weak_ref compatibility flag. This can reduce memory leaks when using WebAssembly-based Workers, which includes Python Workers and Rust Workers . The FinalizationRegistry works by enabling toolchains such as Emscripten and wasm-bindgen to automatically free WebAssembly heap allocations. If you are using WASM and seeing Exceeded Memory errors and cannot determine a cause using memory profiling , you may want to enable the FinalizationRegistry. For more information refer to the enable_weak_ref compatibility flag documentation.