Constraint names using 'user namespace'?

Just noticed this:

pjw=# create table pk1(f1 integer, constraint zzz primary key(f1));
NOTICE:  CREATE TABLE/PRIMARY KEY will create implicit index 'zzz' for
table 'pk1'
CREATE
pjw=# create table zzz(f1 integer);
ERROR:  Relation 'zzz' already exists

Is there a good reason why the automatically created items do not have a
'pg_' in front of their names?


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