function toString() and inspect not working properly

[undefined-moe]

import { Context, Service } from 'cordis';

declare module 'cordis' {
    interface Context {
        foo: FooService;
    }
}

const app = new Context();

class FooService extends Service {
    constructor(ctx) {
        super(ctx, 'foo', true);
    }

    funcA(arg) {
        console.log(arg, arg.toString());
        this.funcB(arg);
    }

    funcB(arg) {
        console.log(arg, arg.toString());
    }
}

app.plugin(FooService);
app.plugin({
    inject: ['foo'],
    apply(ctx) {
        ctx.foo.funcA(class Foo { });
    },
});

node -r @hydrooj/register foo.ts

outputs:

[class Foo] function () { [native code] }
[Function: Foo] function () { [native code] }