Storage.KeyValueMismatch is broken

[chfast]

It seems the usage of the Storage.KeyValueMismatch exception is causing another exception when it is being printed. In the end, user get no information what is mismatched.

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self = Storage(root={0: 1}), address = b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00'
other = Storage(root={1: 1})

    def must_be_equal(self, address: Address, other: "Storage | None"):
        """
        Succeeds only if "self" is equal to "other" storage.
        """
        # Test keys contained in both storage objects
        if other is None:
            other = Storage({})
        for key in self.keys() & other.keys():
            if self[key] != other[key]:
                raise Storage.KeyValueMismatch(
                    address=address, key=key, want=self[key], got=other[key]
                )

        # Test keys contained in either one of the storage objects
        for key in self.keys() ^ other.keys():
            if key in self:
                if self[key] != 0:
>                   raise Storage.KeyValueMismatch(address=address, key=key, want=self[key], got=0)
E                   ethereum_test_tools.common.types.Storage.KeyValueMismatch: <exception str() failed>

src/ethereum_test_tools/common/types.py:314: KeyValueMismatch