Decimal fields get truncated to int

I have geographic data stored in .xls format. The number fields all get truncated to int when this data is uploaded. Example data

Lattitude, Logitude
-27.44314448,127.00122

This data gets truncated to -27 and 127. I tried changing the basic types mapping to double precision, but that does not seem to help. I'm using ckan2.2 on ubuntu with postgres in the development environment [paster, python ]