cluster truncates table name?

Could there be a bug in the 'cluster' command in postgreSQL 6.4? If I
try to cluster a table with a name with more than 8 characters, psql
says:

xxx=> create table x123456789 (xxx text);
CREATE
xxx=> create index x123 on x123456789 (xxx);
CREATE
xxx=> cluster x123 on x123456789;
ERROR: Relation x1234567 Does Not Exist!

If I try this repeatedly, I get:

xxx=> cluster x123 on x123456789;
ERROR: temp_66c31 relation already exists

I'm running PostgreSQL 6.4(.0) on i386 Linux (2.2.6). Please excuse if
I overlooked something in the docs!

Bye, Ulf

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Ulf Mehlig <umehlig(at)zmt(dot)uni-bremen(dot)de>
Center for Tropical Marine Ecology/ZMT, Bremen, Germany
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