New Feature: implemented proper type checking for assignments to variables with explicitly declared types.
New Feature: reportUntypedBaseClass enables reporting of base classes that are Unknown type and therefore defeat all type checking for derived types.
New Feature: reportOptionalContextManager enables reporting of Optional types used with "with" statements.
New Feature: reportOptionalOperand enables reporting of Optional types used within unary and binary statements where None is not otherwise permitted.
New Feature: more complete type checking for operand types for unary and binary statements.
New Feature: relaxed type checking of parameters to constructor of NamedTuple factory class if <NTFactory>.__new__.__defaults__ is assigned a value at some point.
Bug Fix: Type[X] wasn't properly specialized in some cases.
Bug Fix: Literal byte strings (e.g. b'hello') are now properly typed as bytes rather than Unknown type.