Fix ambiguities and broadcasting bugs

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.39%. Comparing base (825b1b9) to head (913122c).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #505   +/-   ##
=======================================
  Coverage   94.39%   94.39%           
=======================================
  Files          19       19           
  Lines        1819     1820    +1     
=======================================
+ Hits         1717     1718    +1     
  Misses        102      102           

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[dlfivefifty]

@jishnub this works around the broadcasting code you wrote (based on an earlier PR by @tkf) for the special case of broadcasting with singleton/missing dimensions

[dlfivefifty]

The windows failure is unrelated.