Using as: WebAssembly-Signatures

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9.52.2.3 Signatures

Function signatures are specified with the signature pseudo-opcode, followed by a simple function signature imitating a C++-mangled function type: F followed by an optional v, then a sequence of i, l, f, and d characters to mark i32, i64, f32, and f64 parameters, respectively; followed by a final E to mark the end of the function signature.