[jira] Created: (LUCY-47) Undefined

[Marvin Humphrey (JIRA)]

Undefined
---------

                 Key: LUCY-47
                 URL: https://issues.apache.org/jira/browse/LUCY-47
             Project: Lucy
          Issue Type: Sub-task
          Components: Core
            Reporter: Marvin Humphrey
            Priority: Blocker


Undefined is a class with only one, canonical singleton instance: UNDEF.  It
is presently used as a sentinel within Hash.

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