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: boolean.rb
    path of file: ./repos/facets/lib/core/facets
    
    the code of the file until where you have to start completion: require 'facets/kernel/true'
require 'facets/kernel/false'

module Kernel
  # Boolean conversion for not bei
    
  def to_b
    case self.downcase.strip
    when 'true', 'yes', 'on', 't', '1', 'y', '=='
      return true
    when 'nil', 'null'
      return nil
    else
      return false
    end