Preserve blocked unit range in more broadcasting operations

[mtfishman]

Fixes #334.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.80%. Comparing base (f6c5555) to head (15a35e1).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #464      +/-   ##
==========================================
+ Coverage   93.67%   93.80%   +0.13%     
==========================================
  Files          19       19              
  Lines        1677     1680       +3     
==========================================
+ Hits         1571     1576       +5     
+ Misses        106      104       -2     

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