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Make handling more consistent: "-S" -> invalid "-S/path/to/source" -> valid "-S /path/to/source" -> valid "-S=/path/to/source" -> now valid "-D" -> invalid "-DStr" -> valid "-D Str" -> valid "-D=Str" -> now valid "--log-level=" -> invalid "--log-level" -> invalid "--log-level=2" -> valid "--log-level 2" -> now valid
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