This is needed for support of WASM standard' https://www.w3.org/TR/wasm-web-api-1/#streaming-modules instantiateStreaming and compileStreaming,
and causes errors like
```
WASM: wasm streaming compile failed: TypeError: Failed to execute 'compile' on 'WebAssembly': Incorrect response MIME type. Expected 'application/wasm'.
```
since plain text is returned instead.
It also doesn't seem to be easily fixable even with `nginx.conf.sigil` substitution