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    >>> resolve_pointer(obj, '/foo') == obj['foo']
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    >>> resolve_pointer(obj, '/foo/another prop') == obj['foo']['another prop']
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    >>> resolve_pointer(obj, '/foo/another prop/baz') == obj['foo']['another prop']['baz']
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    >>> resolve_pointer(obj, '/some/path', None) == None
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    >>> resolve_pointer(obj, '/a b', None) == None
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    >>> resolve_pointer(obj, '/a%20b') == 1
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