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The decimal function in Data.Csv.Conversion.Internal seems to just format a number in decimal format. I was not sure if this really is the case. However, if it is, then one could just replace the calls to this functions with the appropriate intXDec functions from the new bytestring builder. Note that the integerDec function is not the newest version. It will be fast, once I port my newest patches to the darcs repo. Somehow, the state of mine and Duncan's bytestring repository diverged :-/
Thanks for the tip. I will take a look when I find some spare time.
minor performance improvements
Avoid constructing intermediate lists. This mitigates the slowdown from the
switch to the new bytestring builder. More improvements are achievable from
issues #8, #9, and #10.