Special case for Zeros(5)'*b and dot(::AbstractFill,::AbstractFill)

[dlfivefifty]

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[codecov]

Codecov Report

Merging #160 (1a56afa) into master (1f25ae1) will increase coverage by 0.01%.
The diff coverage is 96.66%.

@@            Coverage Diff             @@
##           master     #160      +/-   ##
==========================================
+ Coverage   96.23%   96.25%   +0.01%     
==========================================
  Files           4        4              
  Lines         611      640      +29     
==========================================
+ Hits          588      616      +28     
- Misses         23       24       +1     

Impacted Files	Coverage Δ
src/FillArrays.jl	94.83% <ø> (ø)
src/fillalgebra.jl	98.85% <96.66%> (-0.46%)	⬇️

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