benchmarks

I noticed it is quite tricky at the moment to generate a benchmark with an unbalanced number of examples for each step.
It would be nice to have an option in ni_scenario, nc_scenario and similar to set the number of examples for each step.

Consider:

module Speak
  prepend MemoWise

  def speak
    "speaking!"
  end
  memo_wise :speak
end

class Person
   include Speak
  
   def initialize(word = "hey")
     @word = word
   end

   def talk
     @word
   end
end

p = Person.new("hello")

p.talk
#=> "hello"

p.speak
#=> "speaking!"

What happens when we include modules which are using MemoWise