This reworks the transform function somewhat to speed it up. #64
+38
−28
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This takes the time taken for the ls example from 2.6s to 0.5s on my PC.
The problem mostly seems to be related to the eq function using repr, so I've cached the repr value . I've also rearranged the transform function a little to avoid it finding out if there were any matching children and then getting the first child in the list.
Found one small tweak to improve it but I think this as good as it'll get without a rewrite
Fixes #16