The following bug has been logged online:

Bug reference: 1578
Logged by: Celia McInnis
Email address: celia (AT) drmath (DOT) ca
PostgreSQL version: 8.0.1
Operating system: Linux
Description: ::bit(n) behaves "differently" if applied to bit strings
than integers.
Details:

It's probably not good (at least for mathematicians!) to have the following
give different results:

select B'1110110101'::bit(6);
select B'1110110101'::integer::bit(6);

The first gives 110101 (the 6 least significant bits).
The second gives 111011 (the 6 most significant bis).

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