Previously, it built against 8.4.4 and had issues with the new blob serialization used by default in 9.0.1.
Switch to filling the conversion proc array before iterating over results, instead of checking inside every column value to see if a conversion proc is available. For speed reasons, don't check for conversion procs for char, varchar, and text columns, since those should be returned as strings.
Use compile task instead of build task, move cross compiling its own Rakefile.
Also, add some known issues to the README.