# File lib/hammer_cli/options/normalizers.rb, line 61
        def format(bool)
          bool = bool.to_s
          if bool.downcase.match(/^(true|t|yes|y|1)$/i)
            return true
          elsif bool.downcase.match(/^(false|f|no|n|0)$/i)
            return false
          else
            raise ArgumentError, _("value must be one of true/false, yes/no, 1/0")
          end
        end