COPY TO/FROM broken for newline characters

cqlsh:test> create table if not exists copytest (id int primary key, t text);
cqlsh:test> insert into copytest (id, t) values (1, 'This has a newline
        ... character');
cqlsh:test> insert into copytest (id, t) values (2, 'This has a quote " character');
cqlsh:test> insert into copytest (id, t) values (3, 'This has a fake tab \t character (typed backslash, t)');
cqlsh:test> select * from copytest;

 id | t
----+---------------------------------------------------------
  1 |                           This has a newline\ncharacter
  2 |                            This has a quote " character
  3 | This has a fake tab \t character (entered slash-t text)

(3 rows)

cqlsh:test> copy copytest to '/tmp/copytest.csv';

3 rows exported in 0.034 seconds.
cqlsh:test> copy copytest from '/tmp/copytest.csv';

3 rows imported in 0.005 seconds.
cqlsh:test> select * from copytest;

 id | t
----+-------------------------------------------------------
  1 |                          This has a newlinencharacter
  2 |                          This has a quote " character
  3 | This has a fake tab \t character (typed backslash, t)

(3 rows)