BUG #14121: Constraint UNIQUE

The following bug has been logged on the website:

Bug reference:      14121
Logged by:          Marco
Email address:      m.giraldo@stt-telefonia.it
PostgreSQL version: 9.5.0
Operating system:   Windows 7
Description:

Hi
I have a problem with UNIQUE constraint.
I don't understand the difference from TYPE type UNIQUE(when I declare a
column of the table) and ALTER TABLE table ADD CONSTRAINT column UNIQUE
(column).
How can I remove the UNIQUE option from TYPE declaration?

Best reguards