Implement __hash__ and __eq__ functions on entity_instance

src/ifcopenshell-python/ifcopenshell/__init__.py

@@ -91,6 +91,10 @@ class entity_instance(object):
 	def __repr__(self): return repr(self.wrapped_data)
 	def is_a(self, *args): return self.wrapped_data.is_a(*args)
 	def id(self): return self.wrapped_data.id()
+	def __eq__(self, other):
+		return self.wrapped_data == other.wrapped_data
+	def __hash__(self):
+		return hash((self.id(), self.wrapped_data.file_pointer()))
 	def __dir__(self):
 		return sorted(set(itertools.chain(
 			dir(type(self)),