living dangerously unsafe array cast

[Moelf]

replace #112

before:

julia> const tree = LazyTree("/home/akako/Downloads/Run2012BC_DoubleMuParked_Muons.root", "Events");

julia> @time sum(length, tree.Muon_pt)
  3.389927 seconds (1.22 M allocations: 2.995 GiB, 6.44% gc time, 10.32% compilation time)
149322456

julia> @time sum(length, tree.Muon_pt)
  2.848210 seconds (18.39 k allocations: 2.934 GiB, 2.27% gc time)
149322456

julia> @time sum(length, tree.Muon_pt)
  2.899749 seconds (18.39 k allocations: 2.934 GiB, 2.31% gc time)

after:

julia> const tree = LazyTree("/home/akako/Downloads/Run2012BC_DoubleMuParked_Muons.root", "Events");

julia> @time sum(length, tree.Muon_pt)
  3.359160 seconds (991.40 k allocations: 2.428 GiB, 6.44% gc time, 9.35% compilation time)
149322456

julia> @time sum(length, tree.Muon_pt)
  2.774870 seconds (18.39 k allocations: 2.378 GiB, 1.34% gc time)
149322456

julia> @time sum(length, tree.Muon_pt)
  2.783174 seconds (18.39 k allocations: 2.378 GiB, 1.18% gc time)
149322456

[codecov]

Codecov Report

Merging #147 (2b9096d) into master (ad11fb6) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
- Coverage   91.32%   91.24%   -0.08%     
==========================================
  Files          11       11              
  Lines        1522     1497      -25     
==========================================
- Hits         1390     1366      -24     
+ Misses        132      131       -1     

Impacted Files	Coverage Δ
src/iteration.jl	89.77% <ø> (+0.70%)	⬆️
src/UnROOT.jl	91.30% <100.00%> (-1.01%)	⬇️
src/custom.jl	98.68% <100.00%> (-0.02%)	⬇️
src/root.jl	93.53% <100.00%> (-0.56%)	⬇️
src/displays.jl	75.55% <0.00%> (-0.54%)	⬇️
src/io.jl	89.06% <0.00%> (-0.34%)	⬇️
src/streamsource.jl	82.08% <0.00%> (-0.27%)	⬇️
src/bootstrap.jl	92.99% <0.00%> (-0.10%)	⬇️
... and 5 more

---

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[Moelf]

@aminnj we can't do the ccall in versions <1.7, what's your preferred solution:

1. return BitVector for < 1.7 (i.e. add a @static if-else in LazyBranch definition)
2. do the collect() special case for Boolean for <1.7 (currently in this PR)

[codecov]

Codecov Report

Base: 90.27% // Head: 90.08% // Decreases project coverage by -0.19% ⚠️

Coverage data is based on head (bd63a19) compared to base (8b16c8f).
Patch coverage: 94.11% of modified lines in pull request are covered.

❗ Current head bd63a19 differs from pull request most recent head d275941. Consider uploading reports for the commit d275941 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #147      +/-   ##
==========================================
- Coverage   90.27%   90.08%   -0.20%     
==========================================
  Files          11       11              
  Lines        1625     1613      -12     
==========================================
- Hits         1467     1453      -14     
- Misses        158      160       +2     

Impacted Files	Coverage Δ
src/iteration.jl	89.34% <ø> (+0.55%)	⬆️
src/UnROOT.jl	77.77% <88.88%> (-22.23%)	⬇️
src/custom.jl	97.87% <100.00%> (-0.11%)	⬇️
src/root.jl	93.95% <100.00%> (-0.28%)	⬇️
src/displays.jl	78.26% <0.00%> (+0.23%)	⬆️

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