I had to supply missing ".0" to some rounded floats to avoid errors. Here is the patch:

pgsql_util.erl, line 267:

decode_col(#desc{format=text, type=Float}, Value)
when Float =:= float4; Float =:= float8 ->

ListValue = binary_to_list(Value),
IsFloat   = string:str(ListValue,"."),
if IsFloat > 0 -> FValue = Value;
   true        -> FValue = Value ++ ".0" 
end,
list_to_float(FValue);

http://onerlang.blogspot.com/2009/06/what-is-float.html