@Override
    public int getFieldNumber(String name)
    {
        if (name.length() != 1)
            return 0;
        
        char c = name.charAt(0);
        return c == '_' ? ID_POJO : PolymorphicMapSchema.number(c);
    }
Placeholder for annotated interface/object fields configured to use this.

@author David Yu
@created May 19, 2016
protostuff-runtime/src/main/java/io/protostuff/runtime/PolymorphicPojoMapSchema.java