Fix Pkg bug with stdlibs

[vtjnash]

#312 (comment)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.51%. Comparing base (57d77fb) to head (02d677f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #321   +/-   ##
=======================================
  Coverage   73.51%   73.51%           
=======================================
  Files           5        5           
  Lines         540      540           
=======================================
  Hits          397      397           
  Misses        143      143           

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