Check for flag before defining checkindex

[jishnub]

Since this package is committing type-piracy, a certain degree of coordination is required with FillArrays to avoid breakages if the methods are moved to that package.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.45%. Comparing base (15c4030) to head (e6278be).
⚠️ Report is 10 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
+ Coverage   89.37%   89.45%   +0.08%     
==========================================
  Files          10       10              
  Lines        1129     1138       +9     
==========================================
+ Hits         1009     1018       +9     
  Misses        120      120              

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