[Zope] precision of values returned by ZSQL query

hi everyone, i found a strange behavior regarding values returned from a ZOracleDA ZSQL query. maybe someone here knows how to get around it: ->table PAYMENT: AMOUNT ------ 5000 1.5 ->query select sum(AMOUNT) as total_cash from PAYMENT i am getting 5001 in zope instead of 5001.5 and even applying formatting to it like <dtml-var total_cash fmt="%.1f"> comes out to 5001.0, so i assume the value must get truncated by zope or by the database adapter. the same query in SQLPlus works as intended. has anyone come against this and found a workaround? jens