- Oracle's "native decimal" metadata begins to return

  - Oracle's "native decimal" metadata begins to return
    ambiguous typing information about numerics
    when columns are embedded in subqueries as well
    as when ROWNUM is consulted with subqueries, as we
    do for limit/offset.  We've added these ambiguous
    conditions to the cx_oracle "convert to Decimal()"
    handler, so that we receive numerics as Decimal
    in more cases instead of as floats.  These are
    then converted, if requested, into Integer
    or Float, or otherwise kept as the lossless
    Decimal [ticket:1840].