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WebAssembly Effect-based I/O

Waeio provides a prototype effects-based direct-style I/O model for Wasm. The main purpose of this model is to illustrate the use of stack switching to interleave multiple I/O operations at the same time. Waeio supports two stack switching backends, Asyncify and WasmFX, and two I/O backends, host-defined I/O and WASI.