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If some keys depend on others, we have to check up front since there is no control of what order key handlers will be called. Anyway, keys are unordered in json, so we don't want to depend on ordering.
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Now still have to go through and implement the handlers.
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Since the functionality of argument parsing has moved into QPDFJob, these classes no longer need to be public. Their methods still have to be in the library's binary interface so they can be tested in libtests.
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Fix typos in cli.rst
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Why? The main methods that create them return smart pointers so that users can initialize them when needed, which you can't do with references. Returning pointers instead of references makes for a more uniform interface.
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Use named functions rather than just end() for clarity.
