ps(1) with '-ww' / libxo truncating output

I've noticed that ps(1) (even with '-ww') is truncating output if it
exceeds a cerain length.

Further investigation shows that this is due to the libxo module.

The ps(1) man page implies there will be no truncation if "-ww" is used.

Is this a manpage issue, or a libxo issue, or a ps issue in the way it
calls libxo?

Test cases. These commands (run under sh not csh/tcsh) stuff dummy
variables into the environment. Note the truncated responses of test 1 and 2:

1) env -i $(jot 500 | awk '{print "testvar_"$0"=dummydummydummydummy"}') sh -c 'ps -wwe -p $$'

2) env -i $(jot 500 | awk '{print "testvar_"$0"=dummydummydummydummy"}') sh -c 'ps -wwe -p $$ --libxo text'

3) env -i $(jot 500 | awk '{print "testvar_"$0"=dummydummydummydummy"}') sh -c 'ps -wwe -p $$ --libxo xml'
 
Cheers, Jamie