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No, Go can never use WasmGC because Go has interior pointers. Not even fat pointers help because Go has unboxed types.

Go will continue to use its own GC for the foreseeable future.

Interesting. Can it collect garbage _concurrently_ in WASM?

Last I checked WASM applications are single threaded, not sure if that's changed. GC is concurrent, but not parallelized.