[tor-bugs] #17823 [metrics-lib]: use diamond operator

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#17823: use diamond operator
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 Reporter:  iwakeh       |          Owner:  karsten
     Type:  enhancement  |         Status:  accepted
 Priority:  Low          |      Milestone:
Component:  metrics-lib  |        Version:
 Severity:  Minor        |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:  #17822       |         Points:
  Sponsor:               |
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Comment (by iwakeh):

 I'd suggest changing things when there are changes anyway. Like I did in
 #17821.
 This way there is probably more testing involved than with a big change
 allover.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17823#comment:2>
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