New Feature: Added support for Literal type in typing_extensions.
New Feature: Added typing_extensions.pyi fallback type stub file.
New Feature: Types for arg and kwarg parameters are now correctly inferred to be of type List[X] and Dict[str, X] where X is either specified by the type annotation or assumed to be Unknown.
New Feature: Added type constraint logic for expressions of the form "type(X) is Y" and "type(X) is not Y".
New Feature: Added validation for ClassVar parameters to ensure that it doesn't contain any type variables.
Bug Fix: Fixed bug in "datetime.combine" method in datetime.pyi typeshed type stub.
Bug Fix: Type checker was not properly handling assignments where the LHS was a tuple and the RHS was an utterable type.
Improved responsiveness of VS Code extension.