More special operations for Diagonal{<:Any,<:AbstractFill}

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

Merging #139 (fe06f09) into master (b51bb8a) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #139      +/-   ##
==========================================
+ Coverage   95.65%   95.66%   +0.01%     
==========================================
  Files           4        4              
  Lines         529      531       +2     
==========================================
+ Hits          506      508       +2     
  Misses         23       23              

Impacted Files	Coverage Δ
src/FillArrays.jl	94.27% <100.00%> (+0.03%)	⬆️

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