- update to 4.0.0:
  * Fixed ``@typechecked`` optimization causing compilation of
    instrumented code to fail  when an ``if`` block was left
    empty by the AST transformer
  * Fixed the AST transformer trying to parse the second argument
    of ``typing.Annotated`` as a forward reference
  * Added ``InstrumentationWarning`` to the public API
  * Changed ``@typechecked`` to skip instrumentation in optimized
    mode, as in typeguard 2.x
  * Avoid type checks where the types in question are shadowed by
    local variables
  * Fixed instrumentation using ``typing.Optional`` without a
    subscript when the subscript value was erased due to
    being an ignored import
  * Fixed ``TypeError: isinstance() arg 2 must be a type or tuple
    of types`` when instrumented code tries to check a value
    against a naked (``str``, not ``ForwardRef``)
  * forward reference
  * Fixed instrumentation using the wrong "self" type in the
    ``__new__()`` method
  * Fixed imports guarded by ``if TYPE_CHECKING:`` when used with
    subscripts
  * (``SomeType[...]``) being replaced with ``Any[...]`` instead
    of just ``Any``
  * Fixed instrumentation inadvertently mutating a function's
    annotations on Python 3.7 and 3.8
  * Fixed ``Concatenate[...]`` in ``Callable`` parameters causing
    ``TypeError`` to be raised
  * Fixed type checks for ``*args`` or ``**kwargs`` not being
    suppressed when their types are unusable

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