class data_converter :fromrepr:text_data_repr -> torepr:text_data_repr ->Netchannels.io_obj_channel
fromrepr to
 torepr.
 For simplicity, in an `ASCII input stream the CR characters are
 discarded, and the LF characters are taken as newline characters.
 In an output `ASCII stream, the CR/LF sequence is correctly
 created for newline characters.