ExecutedParams should never be additionally faked, even if they are the first params. They have been legitimately created by a caller.

test/static_analysis/descriptors.py

@@ -0,0 +1,13 @@
+# classmethod
+class TarFile():
+    @classmethod
+    def open(cls, name, **kwargs):
+        return cls.taropen(name, **kwargs)
+
+    @classmethod
+    def taropen(cls, name, **kwargs):
+        return name
+
+
+# should just work
+TarFile.open('hallo')