Accept set as a valid [str]

[lmazuel]

FYI @tstringer

[codecov-io]

Codecov Report

Merging #60 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #60   +/-   ##
=======================================
  Coverage   77.77%   77.77%           
=======================================
  Files         260      260           
  Lines       12696    12696           
=======================================
  Hits         9874     9874           
  Misses       2822     2822

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[trstringer]

Thanks for the super quick turnaround on this, @lmazuel!! 😄 👍