Support cases where the signature contains a non-representable object

[smarie]

From a stack overflow example at https://stackoverflow.com/questions/52126071/decorator-with-arguments-avoid-parenthesis-when-no-arguments

def foo(logger=logging.getLogger('default')):
    pass

@wraps(foo)
def bar(*args, **kwargs):
    pass

bar()

raises SyntaxError: invalid syntax def foo(logger=<logging.Logger object at 0x000001D5844AF518>)