Compose macro fixes

[gilch]

Cleans up some edge cases found during manual testing. More tests will eventually need to be automated.

I still consider this macro experimental. Expect significant changes before it stabilizes.

[gilch]

See also #214 #211 #154

[codecov[bot]]

Codecov Report

Merging #218 (7a4b80a) into master (d6d3c24) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #218   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines          710       710           
  Branches       109       109           
=========================================
  Hits           710       710           

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