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After changing the default visibility to hidden to avoid generating thousands of import/export symbols (browsers have a hard limit of 10k), explicitly setting visibility for "boundary functions" (i.e. wasm callbacks called by JS via pointer) is required to ensure the function can be retrieved via pointer from the function table.
Fixup after #79578 , which mischaracterized the resulting error as emscripten-core/emscripten#19425 (we do start threads from the fat side module, but apparently that does work for us 👀 ).