BUG #5939: About bytea

The following bug has been logged online:

Bug reference:      5939
Logged by:          Vincent Chan
Email address:      joy717.xmu@gmail.com
PostgreSQL version: 9.0
Operating system:   Win7 x64
Description:        About bytea
Details:

when saving a bytes array,
for example a bytes array which length is 2,
but after saving,
it's length will be change to 3.
but in postgres 8.4, the array length is still 2.
Is this a bug?