Workaround type inference issue on Julia master

[jipolanco]

Fixes #138

[dlfivefifty]

Thanks! Do you know why this regression happened? Maybe we should file an issue on JuliaLang/julia if it can be reproduced on a simpler example?

[jipolanco]

You're right, it may be a regression in base Julia. I'll see if I can reproduce a minimal example and file an issue.

[codecov]

Codecov Report

Merging #139 into master will decrease coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #139      +/-   ##
==========================================
- Coverage   87.46%   87.40%   -0.07%     
==========================================
  Files          12       12              
  Lines        1540     1540              
==========================================
- Hits         1347     1346       -1     
- Misses        193      194       +1     

Impacted Files	Coverage Δ
src/lazyconcat.jl	93.81% <100.00%> (ø)
src/lazyoperations.jl	86.72% <0.00%> (-0.45%)	⬇️

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[jipolanco]

Closing this because inference regression was fixed on Julia master.