include? vs cover?

gistfile1.rb

require 'benchmark/ips'
 
Benchmark.ips do |x|
  x.config(:time => 5, :warmup => 2)
 
  x.time = 5
  x.warmup = 2
 
  no_of_times = 1_000_000
  last_value = 10000
 
  x.report("include?") do
    no_of_times.times do
      (1 .. last_value).include?(5666)
    end
  end
 
  x.report("cover?") do
    no_of_times.times do
      (1 .. last_value).cover?(5666)
    end
  end
  x.compare!
end