class SimpleCov::ExitCodes::MaximumCoverageDropCheck

def drop_percent(criterion)
  drop = last_coverage(criterion) -
         SimpleCov.round_coverage(
           result.coverage_statistics.fetch(criterion).percent
         )
  # floats, I tell ya.
  # irb(main):001:0* 80.01 - 80.0
  # => 0.010000000000005116
  drop.floor(MAX_DROP_ACCURACY)
end