[metrics-bugs] #30351 [Metrics/Website]: Unknown error in prepare_* functions using the spread() function

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#30351: Unknown error in prepare_* functions using the spread() function
-----------------------------+------------------------------
 Reporter:  karsten          |          Owner:  metrics-team
     Type:  defect           |         Status:  needs_review
 Priority:  High             |      Milestone:
Component:  Metrics/Website  |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:                   |  Actual Points:
Parent ID:                   |         Points:
 Reviewer:                   |        Sponsor:
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Changes (by karsten):

 * status:  new => needs_review


Comment:

 The spread() function works fine again using buster's r-cran-tidyr 0.8.2-1
 package, whereas it was previously broken with stretch's r-cran-tidyr
 0.6.1-1 package.

 Please review [https://gitweb.torproject.org/user/karsten/metrics-
 web.git/commit/?h=task-30351&id=ca90cf134c1e759debbb2b925c7ec785ba0131ad
 commit ca90cf1 in my task-30351 branch].

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/30351#comment:6>
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