Provide an IN operator
----------------------

                 Key: JEXL-118
                 URL: https://issues.apache.org/jira/browse/JEXL-118
             Project: Commons JEXL
          Issue Type: New Feature
    Affects Versions: 2.0.1
            Reporter: Max Tardiveau


It would be very useful to have an IN operator, e.g.:

status in ['A', 'B', 'C']

This can currently be done with :

status == 'A' or status == 'B' or status == 'C'

but (especially for longer lists) the IN operator would be more concise and 
more elegant.

Extra bonus points, of course, if this works with variables, e.g.:

status in possibleStatuses

where possibleStatuses would be an object of type Collection.

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