mod_plsql question re max length of POSTed data

Hi folks

With 9i on Solaris we seem to be able to post large values (>32k) via mod_plsql where in 10g it appears there is a restriction.

The doc for 10g (9.0.4 of AS)

http://download-west.oracle.com/docs/cd/B10464_05/web.904/b10357/concept.htm#1006241

"mod_plsql limits the size of a single parameter that can be passed to a procedure to 32000 bytes."

This is a barrier to migrating to 10g - don't understand why the limitation doesn't appear to exist in 9i?

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jeremy