Does Julia Create a "1.5" Language Problem?

Community Teaching & Outreach
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And for completeness, here’s how the Julia times change if xxx is made const:

 > julia quicksort.jl
With type unstable ZeroArray wrapper:
BenchmarkTools.Trial: 58 samples with 1 evaluation.
 Range (min … max):  85.002 ms … 98.931 ms  ┊ GC (min … max): 0.00% … 0.00%
 Time  (median):     85.927 ms              ┊ GC (median):    0.31%
 Time  (mean ± σ):   87.055 ms ±  2.816 ms  ┊ GC (mean ± σ):  0.33% ± 0.32%

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  ██▃███▅▁▁▅▁▅▃█▁▁▃▃▃▁▃▃▁▃▁▁▁▁▁▃▃▁▁▁▁▁▁▁▁▁▁▃▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▁▃ ▁
  85 ms           Histogram: frequency by time        97.6 ms <

 Memory estimate: 25.94 MiB, allocs estimate: 1700025.

Without ZeroArray wrapper:
BenchmarkTools.Trial: 746 samples with 1 evaluation.
 Range (min … max):  6.560 ms …  11.054 ms  ┊ GC (min … max): 0.00% … 0.00%
 Time  (median):     6.585 ms               ┊ GC (median):    0.00%
 Time  (mean ± σ):   6.695 ms ± 357.016 μs  ┊ GC (mean ± σ):  0.00% ± 0.00%

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  █████████▅▇▇▅▅▁▅▆▆▆▆▅▄▄▅▅▁▄▁▁▁▁▁▄▁▁▁▁▁▁▄▁▁▁▁▁▁▁▁▁▁▁▁▄▁▁▁▁▄▄ ▇
  6.56 ms      Histogram: log(frequency) by time      8.56 ms <

 Memory estimate: 0 bytes, allocs estimate: 0.
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