ycqlsh fails on COPY TO with `got an unexpected keyword argument 'encoding'` about cqlsh HOT 3 OPEN

12:26 $ ./bin/ycqlsh --debug
Using CQL driver: <module 'cassandra' from '/Users/yugabyte/code/yugabyte-db/thirdparty/installed/common/cqlsh/bin/../lib/cassandra-driver-internal-only-3.13.0.post0-743d942c.zip/cassandra-driver-3.13.0.post0-743d942c/cassandra/__init__.py'>
Using connect timeout: 5 seconds
Using 'utf-8' encoding
Using ssl: False
Connected to local cluster at 127.0.0.1:9042.
[ycqlsh 5.0.1 | Cassandra 3.9-SNAPSHOT | CQL spec 3.4.2 | Native protocol v4]
Use HELP for help.
ycqlsh> copy sample.t to STDOUT;
Detected 12 core(s)
Using 11 child processes

Starting copy of sample.t with columns [a].
Closing parent cluster sockets
Closing parent cluster sockets
Closing parent cluster sockets
Closing parent cluster sockets
Closing parent cluster sockets
Closing parent cluster sockets
Closing parent cluster sockets
Closing parent cluster sockets
Closing parent cluster sockets
Closing parent cluster sockets
Closing parent cluster sockets
Created connection to ('127.0.0.1',) with page size 1000 and timeout 10 seconds per page
1
2
3
Processed: 3 rows; Rate:      29 rows/s; Avg. rate:      29 rows/s
3 rows exported to 0 files in 0.115 seconds.
ycqlsh> exit

12:25 $ ./bin/cqlsh 
Connected to local cluster at 127.0.0.1:9042.
[ycqlsh 5.0.1 | Cassandra 3.9-SNAPSHOT | CQL spec 3.4.2 | Native protocol v4]
Use HELP for help.
ycqlsh> copy sample.t to STDOUT;
<lambda>() got an unexpected keyword argument 'encoding'
ycqlsh> exit;

self.printmsg = printmsg if self.fname is not None or direction == 'from' or DEBUG \
            else lambda _, eol='\n': None

self.printmsg = printmsg if self.fname is not None or direction == 'from' or DEBUG \
            else swallowmsg

def swallowmsg(msg, eol='', encoding=''):
    None