>> the charX types (char2, 4, 8, 16) are not well supported. They are
>> likely to disappear in the next release, with the parser mapping them to
>> char(X) (or varchar(X), whichever is the best match) for backward
>> compatibility.
>> 
>> The major string types are char(), varchar(), and text.

> Is there a performance hit if the values chosen are not powers of 2?

No, the smaller the better.

Andreas

Wed, 4 Mar 1998 09:34:15 +0100 
Zeugswetter Andreas SARZ <Andreas.Zeugswetter@telecom.at>
Re: [HACKERS] no operator '=' for types char16 and text