Remove -rectypes from BatFingerTree, simplify the implementation
#1012
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The option
-rectypeshas a non-obvious impact on the type theory of OCaml, it is better to not require it for some modules.-rectypeswas used in the implementation of enumeration of finger trees, to implement a specific form of continuation-passing-style. The new implementation uses plain old datatypes, so it is simpler (and shorter). Benchmarking suggests that there are no performance differences.