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a6321e7201
- The `dict` field is optional, hence avoid an Error if trying to clone a non-existent dictionary.
- Use the `length` getter in the `Stream` class, to avoid duplication.
- Fix the `DecodeStream` implementation, since it has a couple of bugs:
- The `clone` method currently uses `start`/`end` fields, despite these only existing on `Stream` instances.
- Given the previous point, we ended up creating the cloned `Stream` instance using the *entire* underlying `buffer`. This is problematic since the length of a `DecodeStream` cannot be accurately estimated before decoding, and the `buffer`-length is simply a multiple of two.
Unless the size of the decoded-data just happens to also be a multiple of two, this causes the cloned `Stream` instance to be "padded" with zeros at the end.