Override __eq__ method also for Quadratic and others (#224)

Additional fix of #222. Since `__eq__` cannot be inherited, we have to
manually override it.

python/ommx/ommx/v1/__init__.py

@@ -1233,22 +1233,6 @@ def __neg__(self) -> Linear:
         return -1 * self
 
     def __eq__(self, other) -> Constraint:  # type: ignore[reportIncompatibleMethodOverride]
-        """
-        Create a constraint that this linear function is equal to the right-hand side.
-
-        Examples
-        ========
-
-        >>> x = DecisionVariable.integer(1)
-        >>> y = DecisionVariable.integer(2)
-        >>> x + y == 1
-        Constraint(...)
-
-        To compare two objects, use :py:meth:`almost_equal` method.
-
-        >>> assert (x + y).almost_equal(Linear(terms={1: 1, 2: 1}))
-
-        """
         return Constraint(
             function=self - other, equality=Equality.EQUALITY_EQUAL_TO_ZERO
         )
@@ -1448,6 +1432,11 @@ def __rmul__(self, other):
     def __neg__(self) -> Linear:
         return -1 * self
 
+    def __eq__(self, other) -> Constraint:  # type: ignore[reportIncompatibleMethodOverride]
+        return Constraint(
+            function=self - other, equality=Equality.EQUALITY_EQUAL_TO_ZERO
+        )
+
 
 @dataclass
 class Polynomial(AsConstraint):
@@ -1633,6 +1622,11 @@ def __rmul__(self, other):
     def __neg__(self) -> Linear:
         return -1 * self
 
+    def __eq__(self, other) -> Constraint:  # type: ignore[reportIncompatibleMethodOverride]
+        return Constraint(
+            function=self - other, equality=Equality.EQUALITY_EQUAL_TO_ZERO
+        )
+
 
 def as_function(
     f: int
@@ -1867,6 +1861,11 @@ def __rmul__(self, other):
     def __neg__(self) -> Function:
         return -1 * self
 
+    def __eq__(self, other) -> Constraint:  # type: ignore[reportIncompatibleMethodOverride]
+        return Constraint(
+            function=self - other, equality=Equality.EQUALITY_EQUAL_TO_ZERO
+        )
+
 
 @dataclass
 class Constraint: