OneEvent isn't always empty

[ganmacs]

Signed-off-by: Yuta Iwama [email protected]

Which issue(s) this PR fixes:
Fixes #

What this PR does / why we need it:

require 'benchmark/ips'

class A
  def empty?
    size == 0
  end
end

class B < A
  def size
    1
  end
end

class C < A
  def empty?
    false
  end
end


b = B.new
c = C.new

Benchmark.ips do |x|
  x.report("b") do
    b.empty?
  end

  x.report("c") do
    c.empty?
  end
end

Warming up --------------------------------------
                   b   437.425k i/100ms
                   c   454.017k i/100ms
Calculating -------------------------------------
                   b     16.370M (± 6.5%) i/s -     81.798M in   5.021556s
                   c     22.938M (± 3.4%) i/s -    114.866M in   5.013438s

Docs Changes:

no need

Release Note:

same as title

[repeatedly]

Good catch!