[MacPorts] #69107: Ruby: perhaps get rid of separate rb19 ports and move those to subports?

[MacPorts]

#69107: Ruby: perhaps get rid of separate rb19 ports and move those to subports?
--------------------------+--------------------------
 Reporter:  barracuda156  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.8.1
 Keywords:                |       Port:  ruby, ruby19
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 It appears pretty inconsistent: rb18- are in fact subports (see `rb-rake`,
 for example), but rb19- are separate ports.
 Are there good reasons to have it that way?

 Or otherwise maybe more rb18- into separate ports too, and then update rb-
 ports to current versions for modern Ruby.

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Ticket URL: <https://trac.macports.org/ticket/69107>
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