 
 #-----------------------------------------------------------------------------------------------------------
 @$gliding_window = ( width, method ) ->
-  throw new Error "expected a number, got a #{type}" unless ( CND.type_of width ) is 'number'
+  throw new Error "µ32363 expected a number, got a #{type}" unless ( CND.type_of width ) is 'number'
   section = []
   send    = null
   #.........................................................................................................

          when 'text'
            joiner ?= ''
          when 'buffer'
            throw new Error "joiner not supported for buffers, got #{rpr joiner}" if joiner?
          else
            throw new Error "expected a text or a buffer, got a #{type}"
      else
        unless ( this_type = CND.type_of data ) is type
          throw new Error "expected a #{type}, got a #{this_type}"
      length += data.length
      collector.push data
    else

    #.......................................................................................................
    validate_type = ( type_a, type_b, include_list = no ) =>
      unless type_a is type_b
        throw new Error "µ35423 unable to compare a #{type_a} with a #{type_b}"
      if include_list
        unless type_a in [ 'number', 'date', 'text', 'list', ]
          throw new Error "µ36188 unable to compare values of type #{type_a}"
      else
        unless type_a in [ 'number', 'date', 'text', ]
          throw new Error "µ36953 unable to compare values of type #{type_a}"
      return null
    #.......................................................................................................
    if key?
