limit_to_size

# File activerecord/lib/active_record/connection_adapters/mysql/schema_statements.rb, line 303
          def limit_to_size(limit, type)
            case type.to_s
            when "text", "blob", "binary"
              case limit
              when 0..0xff;               "tiny"
              when nil, 0x100..0xffff;    nil
              when 0x10000..0xffffff;     "medium"
              when 0x1000000..0xffffffff; "long"
              else raise ArgumentError, "No #{type} type has byte size #{limit}"
              end
            end
          end