docs: public static void modify(
  			int calleeValKind,
  			Object callee,
  			String calleeClass,
  			String fieldName,
  			int callerValKind,
  			Object caller,
  			String callerClass) {
  		System.err.println("modify(          "+
  				valAndValKindToString(callee, calleeClass, calleeValKind)+
  				" . "+fieldName+", "+
  //				"calleeClass="+calleeClass+", "+
  				"caller="+valAndValKindToString(caller, callerClass, callerValKind)+", "+
  //				"callerClass="+callerClass+", "+
  				")");
  	}