[FIX] off-by-one-error in threshold computation

[eseiler]

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[codecov]

Codecov Report

Merging #54 (ac1807d) into master (dac69f3) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #54   +/-   ##
=======================================
  Coverage   84.46%   84.46%           
=======================================
  Files          29       29           
  Lines         914      914           
=======================================
  Hits          772      772           
  Misses        142      142           

Impacted Files	Coverage Δ
src/search/detail/helper.cpp	100.00% <100.00%> (ø)

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