As moritz has said, setting DBI_TRACE=15=x.log, running your script and looking at x.log might give you a clue.
Annoyingly you cannot see the Changes file for DBD::DB2 on search.cpan.org unless you browse the sources. http://cpansearch.perl.org/src/IBMTORDB2/DBD-DB2-1.84/Changes doesn't seem to suggest any relevant bugs were fixed between 1.78 and 1.84.
I can happily insert numbers into an integer column using bound parameters with DBD::ODBC and the db2 driver.
Out of interest, exactly what is in ($enc_comp_off, $enc_comp_len, $enc_doc_off, $enc_doc_len) - you didn't show us.
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