5.2.1.5 List and Dictionary Mutually Exclusive
If [is list] is True, [is dictionary] MUST be False (from which the converse follows: if [is dictionary] is True, [is list] MUST be False.)
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If [is list] is True, [is dictionary] MUST be False (from which the converse follows: if [is dictionary] is True, [is list] MUST be False.)