spmallette opened a new pull request, #3644:
URL: https://github.com/apache/tinkerpop/pull/3644

   … input
   
   Expand the product() considerations in the Gremlin semantics document to 
specify the cartesian product cardinality and the row-major order in which 
pairs are emitted, that duplicate elements are preserved, and that an empty 
operand yields a single empty list rather than no result or an error. Also 
clarify that only a non-iterable incoming traverser or resolved argument raises 
an error, while a null appearing as a member of an otherwise valid list is a 
legal element.
   
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