Modifier optional positional argument interferes with named argument

[adc-mhaugen]

Versions: "@glint/core": "^1.2.0", "environment": "ember-loose"

Code:

import Modifier from 'ember-modifier';

interface FooSignature {
    Element: HTMLElement;
    Args: {
        Positional: [boolean, string?];
        Named: { debounce?: number };
    };
}

export default class FooModifier extends Modifier<FooSignature> {
    modify(
        element: HTMLElement,
        [b, s]: [boolean, string?],
        { debounce }: { debounce?: number }
    ) {
        console.log('foo', element, b, s, debounce);
    }
}

declare module '@glint/environment-ember-loose/registry' {
    export default interface Registry {
        foo: typeof FooModifier;
    }
}

When I try to use the modifier without the optional second positional argument I get this error:

Argument of type '{ [NamedArgs]: true; debounce: number; }' is not assignable to parameter of type 'string'.glint(2345)

Are optional positional arguments not supported or am I doing something else wrong?

thanks!