Ruby: Struct vs Class performance

struct_vs_class.rb

require 'benchmark/ips'

Benchmark.ips do |x|
  SingleFilterStruct = Struct.new(:method, :values) do
    def call(value)
      Array(value).any? { |v| v.send(method, *values) }
    end
  end

  class SingleFilterClass
    def initialize(method, values)
      @method = method
      @values = values
    end

    def call(value)
      Array(value).any? { |v| v.send(@method, *@values) }
    end
  end

  x.report("struct") do
    filter = SingleFilterStruct.new(:eql?, 'aa')
    filter.call('aa')
  end

  x.report("class") do
    filter = SingleFilterClass.new(:eql?, 'aa')
    filter.call('aa')
  end

  x.compare!
end

Calculating -------------------------------------
              struct    63.273k i/100ms
               class    66.284k i/100ms
-------------------------------------------------
              struct      1.069M (± 5.2%) i/s -      5.378M
               class      1.094M (± 5.2%) i/s -      5.502M

Comparison:
               class:  1094260.4 i/s
              struct:  1069255.2 i/s - 1.02x slower