You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: gc.rb
    path of file: ./repos/truffleruby/src/main/ruby/truffleruby/core
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

# Copyright (c) 2015, 2024 Oracle and/or its affiliates. All rights reserved. This
# code is released under a tri EPL/GPL/LGPL license. You can use it,
# redistribute it and/or modify it under the terms of the:
#
# Eclipse Public License version 2.0, or
# GNU General Public License version 2, or
# GNU Lesser General Public License version 2.1.

# Copyright (c) 2007-2015, Evan Phoenix and contributors
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following
    
  def self.stat_hash(key_or_hash)
    if Primitive.is_a?(key_or_hash, Symbol)
      case key_or_hash
      when :time
        Primitive.gc_stat[0]
      when :count
        Primitive.gc_stat[1]
      when :minor_gc_count
        Primitive.gc_stat[2]
      when :major_gc_count
        Primitive.gc_stat[3]
      when :unknown_count
        Primitive.gc_stat[4]
      when :used, :heap_live_slots
        Primitive.gc_stat[5]
      when :committed, :heap_available_slots
        Primitive.gc_stat[6]
      when :heap_free_slots
        stat = Primitive.gc_stat
        stat[6] - stat[5]
      when :init
        Primitive.gc_stat[7]
      when :max
        Primitive.gc_stat[8]
      else
        # differs from MRI, more compatible than raising argument error, use GC.stat.key? to check if key is supported
        0
      end