如何在numba jitclass python中传递类中的字符串类型？

from numba import jitclass, types

@jitclass
class MyClass(object):
    def __init__(self, my_string):
        self.my_string = my_string

def __init__(self, my_string):
    self.my_string = types.unicode_type(my_string)

my_instance = MyClass(u"Hello World")