Support converting Fills to StepRangeLen

[dlfivefifty]

No description provided.

[codecov]

Codecov Report

Merging #290 (9e98677) into master (a718e2f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #290   +/-   ##
=======================================
  Coverage   99.88%   99.88%           
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  Files           5        5           
  Lines         869      871    +2     
=======================================
+ Hits          868      870    +2     
  Misses          1        1           

Files Changed	Coverage Δ
src/FillArrays.jl	99.74% <100.00%> (+<0.01%)	⬆️

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[dlfivefifty]

@jishnub do you know what I should do about invalidations?

[jishnub]

This specific invalidation due to convert appears to be absent on v1.10, so perhaps we may ignore the error. In any case, I doubt that it's this package's fault, as the unique method in Base that leads to this has issues in its implementation.