That has promise, Kristoffer.  I did port something of that nature, 
expecting it to work well -- but there was some numerical mush in more than 
a couple of trailing bits in some cases.
Using more terms did not help. Thinking about it just now, it might be more 
robustly stable if I  expand in one direction only upfrom or downfrom some 
pretabulated points.

On Saturday, October 17, 2015 at 2:47:57 AM UTC-4, Kristoffer Carlsson 
wrote:
>
> Use a truncated Taylor series around the point maybe? 

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