sub_materialize axes and fill

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

Merging #152 into master will decrease coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #152      +/-   ##
==========================================
- Coverage    71.7%   71.69%   -0.02%     
==========================================
  Files          21       21              
  Lines        2446     2448       +2     
==========================================
+ Hits         1754     1755       +1     
- Misses        692      693       +1

Impacted Files	Coverage Δ
src/banded/BandedMatrix.jl	81.25% <0%> (-0.26%)	⬇️
src/banded/gbmm.jl	92.3% <100%> (+0.08%)	⬆️
src/generic/indexing.jl	63.15% <100%> (ø)	⬆️

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