[transform] Add __eq__ / __ne__ to DecomposedTransform

Lib/fontTools/misc/transform.py

@@ -423,6 +423,26 @@ class DecomposedTransform:
     tCenterX: float = 0
     tCenterY: float = 0
 
+    def __eq__(self, other):
+        if not isinstance(other, DecomposedTransform):
+            return NotImplemented
+        return (
+            self.translateX == other.translateX
+            and self.translateY == other.translateY
+            and self.rotation == other.rotation
+            and self.scaleX == other.scaleX
+            and self.scaleY == other.scaleY
+            and self.skewX == other.skewX
+            and self.skewY == other.skewY
+            and self.tCenterX == other.tCenterX
+            and self.tCenterY == other.tCenterY
+        )
+
+    def __ne__(self, other):
+        if not isinstance(other, DecomposedTransform):
+            return NotImplemented
+        return not self == other
+
     @classmethod
     def fromTransform(self, transform):
         # Adapted from an answer on