String values returned from Guile procedures not typed as strings in JavaScript

Hi all,

I've noticed that when a Guile procedure returns a string, that value is not typed as a string in the JavaScript code. (Or possibly returned at all.)

e.g.

;; foo.scm, compiled with guild compile-wasm foo.scm -o foo.wasm
(string-append "a" "b")

;; js wrapper
async function load() {
    const [foo] = await Scheme.load_main("foo.wasm");
    console.log(foo);
}

window.addEventListener("load", load);

Expected result: ab printed to browser console

Actual result: Object { reflector: {}, obj: WasmStructObject } printed to console.

If (string-append "a" "b") is replaced with "ab", the behavior is as expected. The behavior is also as expected if Hoot is the one to run the Wasm bundle, such as guild compile-wasm ... --run.

I'm simultaneously new to Hoot, JavaScript, and Wasm, so apologies if I'm just doing something silly.

I'm on Hoot 0.6.0, LibreWolf 135.