Is it worth caching ActiveSupport::Inflector inflections that get used a lot

bench.rb

require 'benchmark'

Benchmark.bmbm do |bench|
  regexp = /s$/i
  empty  = ''  hash   = {
    'boxes' => 'box',
    'windows' => 'window',    'buttons' => 'button',
    'Buttons' => 'button',
    'dialogs' => 'dialog'
  }

  n = 1_000_000
  s = 'buttons'

  bench.report('match a regular expression') do
    n.times do
      s.gsub! regexp, empty
    end
  end

  bench.report('perform a hash lookup') do
    n.times do
      hash[s]
    end
  end

end

Rehearsal --------------------------------------------------------------
match a regular expression   4.150000   0.080000   4.230000 (  3.850578)
perform a hash lookup        0.080000   0.000000   0.080000 (  0.081487)
----------------------------------------------------- total: 4.310000sec

                                 user     system      total        real
match a regular expression   4.370000   0.090000   4.460000 (  4.026845)
perform a hash lookup        0.090000   0.000000   0.090000 (  0.083497)

Hell yes!