Use combine_eltypes in broadcasting

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

Merging #240 (3e79511) into master (0d506eb) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #240      +/-   ##
==========================================
+ Coverage   75.53%   75.59%   +0.06%     
==========================================
  Files          23       23              
  Lines        2849     2848       -1     
==========================================
+ Hits         2152     2153       +1     
+ Misses        697      695       -2     

Impacted Files	Coverage Δ
src/generic/broadcast.jl	92.48% <100.00%> (+0.36%)	⬆️

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