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* Fixes another case of ``AssertionError`` on ``url_item.is_processed`` when robots.txt was enabled.
* Fixes crash if a malformed gzip response was received.
* Fixes ``--span-hosts`` to be implicitly enabled (as with ``--no-robots``) if ``--recursive`` is not supplied. This behavior unconditionally allows downloading a single file without specifying any options. It is what a user intuitively expects.