Don't queue/parse redundant items

Registered by Bruce Long

Currently, some items in the parse tree are queued for processing multiple time. In situations such as natural language analysis this would lead to exponential explosion.

Blueprint information

Status:
Not started
Approver:
Bruce Long
Priority:
Medium
Drafter:
Bruce Long
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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