In Apex, can I detect if an Object is a Map, regardless of parameterized types?

It's ugly and hackish, but this works:

public class MAP_Detector {
    public Boolean isMap(Object obj) {
        String str = String.valueOf(obj);
        String firstCharacter = str.substring(0, 1);
        String lastCharacter = str.substring(str.length() - 1, str.length());
        return !(obj instanceof String)
            && '{'.equals(firstCharacter)
            && '}'.equals(lastCharacter);
    }
}