allow external references and fix closures

[adamhathcock]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.87%. Comparing base (604e141) to head (73d65b5).
Report is 1 commits behind head on dev.

Additional details and impacted files

@@             Coverage Diff             @@
##              dev     #174       +/-   ##
===========================================
+ Coverage   53.09%   65.87%   +12.78%     
===========================================
  Files         238      254       +16     
  Lines        9238     9885      +647     
  Branches     1072     1073        +1     
===========================================
+ Hits         4905     6512     +1607     
+ Misses       4083     3024     -1059     
- Partials      250      349       +99     

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