reserved role names

Hey,

For grins while writing up an example on RLS for a client I tried the 
following:

policy=# create role insert;
CREATE ROLE

policy=# create role select;
ERROR:  syntax error at or near "select"
LINE 1: create role select;                    ^
policy=# create role delete;
CREATE ROLE

Is it intentional that insert and delete are allowed and select is not 
or is it an oversight?

Sincerely,

JD

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