No parameter values checking while creating Alter subscription...Connection

Hi,

We usually check connection parameter values while creating create
subscription

\\port is WRONG

postgres=# create subscription c1 connection 'port=4000 ' publication pub;
ERROR: could not connect to the publisher: could not connect to server:
No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/tmp/.s.PGSQL.4000"?
postgres=#

\\when database doesn't exist

postgres=# create subscription c1 connection 'dbname=postgre '
publication pub;
ERROR: could not connect to the publisher: FATAL: database "postgre"
does not exist
postgres=#

but such checking is not done at the time of alter subscription ..
connection

postgres=# alter subscription c1 connection 'port=4000';
ALTER SUBSCRIPTION
postgres=# alter subscription c1 connection 'dbname=cc';
ALTER SUBSCRIPTION

--
regards,tushar
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