class Thor::Options

def parse_boolean(switch)


Parse boolean values which can be given as --foo=true, --foo or --no-foo. 
def parse_boolean(switch)
  if current_is_value?
    if ['true', 'TRUE', 't', 'T', true].include?(peek)
      shift
      true
    elsif ['false', 'FALSE', 'f', 'F', false].include?(peek)
      shift
      false
    else
      true
    end
  else
    @switches.key?(switch) || !no_or_skip?(switch)
  end
end