ruby-nakayoshi-fork - 0.0.4-1.1 main

MRI 2.1 employs generational GC algorithms that separate YOUNG objects and OLD
objects. Young objects will be promoted to old objects when they survive 1 GC.
.
However, Ruby 2.2 employs an algorithm to promote young objects after 3 GCs.
.
nakayoshi_fork promotes most of young objects before fork by invoking GC some
times.