src/vs/base/common/mime.ts/isUnspecific
export function isUnspecific(mime: string[] | string): boolean {
	if (!mime) {
		return true;
	}

	if (typeof mime === 'string') {
		return mime === Mimes.binary || mime === Mimes.text || mime === Mimes.unknown;
	}

	return mime.length === 1 && isUnspecific(mime[0]);
}