Add use cases of x. prefix in joins to the join vignette
@venom1204 is already working on this.
Since Jun 18, 2026.
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Description
Submitted by: Matt Dowle; Assigned to: Matt Dowle; R-Forge link
Needed for key only tables, and calculating staleness.
http://r.789695.n4.nabble.com/Joins-in-data-table-tp2315235p3255886.html
Add examples to vignette(s).
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