python-postgres
diff --git a/‎postgresql/api.py‎
Lines changed: 14 additions & 0 deletions b/‎postgresql/api.py‎
Lines changed: 14 additions & 0 deletions
diff --git a/‎postgresql/message.py‎
Lines changed: 2 additions & 4 deletions b/‎postgresql/message.py‎
Lines changed: 2 additions & 4 deletions
diff --git a/‎postgresql/test/test_driver.py‎
Lines changed: 1 addition & 1 deletion b/‎postgresql/test/test_driver.py‎
Lines changed: 1 addition & 1 deletion
@@ -101,6 +101,20 @@ def details(self) -> dict:
 		 * 'internal_query'
 		"""
 
+	@abstractmethod
+	def isconsistent(self, other) -> bool:
+		"""
+		Whether the fields of the `other` Message object is consistent with the
+		fields of `self`.
+
+		This *must* return the result of the comparison of code, source, message,
+		and details.
+
+		This method is provided as the alternative to overriding equality;
+		often, pointer equality is the desirable means for comparison, but
+		equality of the fields is also necessary.
+		"""
+
 class Result(Element):
 	"""
 	A result is an object managing the results of a prepared statement.
 
@@ -48,9 +48,9 @@ def _e_metas(self, get0 = itemgetter(0)):
 		'CLIENT',
 	)
 
-	def __eq__(self, other):
+	def isconsistent(self, other):
 		if not isinstance(other, self.__class__):
-			return NotImplemented
+			return False
 		# creator is contextual information
 		return (
 			self.code == other.code and \
@@ -59,8 +59,6 @@ def __eq__(self, other):
 			self.source == other.source
 		)
 
-	__hash__ = object.__hash__
-
 	def __init__(self,
 		message : "The primary information of the message",
 		code : "Message code to attach (SQL state)" = None,
 
@@ -1512,7 +1512,7 @@ def add(x):
 			if last is None:
 				last = x
 				continue
-			self.failUnlessEqual(x, last)
+			self.failUnless(x.isconsistent(last))
 			last = x
 
 if __name__ == '__main__':