Fix some TimeArray performance problems on 1.8

[davidanthoff]

No description provided.

[codecov]

Codecov Report

Merging #911 (dc61778) into master (aac4868) will decrease coverage by 0.00%.
The diff coverage is 89.47%.

@@            Coverage Diff             @@
##           master     #911      +/-   ##
==========================================
- Coverage   84.56%   84.56%   -0.01%     
==========================================
  Files          40       40              
  Lines        3882     3881       -1     
==========================================
- Hits         3283     3282       -1     
  Misses        599      599              

Flag	Coverage Δ
unittests	84.56% <89.47%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
src/core/time_arrays.jl	93.43% <88.88%> (-0.02%)	⬇️
src/mcs/montecarlo.jl	88.45% <100.00%> (ø)

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