dstandish opened a new pull request #20184:
URL: https://github.com/apache/airflow/pull/20184


   Bitwise XOR is not very readable, only works with True / False, and only 
works with two values.  E.g. if you need to test "exactly one of a, b, or c", 
you cannot do  a ^ b ^ c.  I add an "exactly_one" boolean helper to address all 
of these shortcomings.
   


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