code: protected void onFieldBits(final Object obj, final Field field, final Bin annotation, final JBBPBitNumber bitNumber, final int value) {
  
    }
docs: Notification about bit field.
  
  @param obj        the object instance, must not be null
  @param field      the field, must not be null
  @param annotation the annotation for field, must not be null
  @param bitNumber  number of bits for the field, must not be null
  @param value      the value of the field