Class precedence list:

ext:character-conversion-output-stream, ext:character-conversion-stream, ext:encapsulating-character-output-stream, ext:encapsulating-output-stream, ext:encapsulating-character-stream, ext:encapsulating-stream, ext:character-output-stream, ext:output-stream, ext:character-stream, stream, standard-object, ext:instance, t.

Character conversion output stream. This stream keeps track of the line column and optionally performs line buffering.