Unfortunate overlap in functionality is unfortunate.

$ git grep -i kahan
std/algorithm/iteration.d:$(D sum) uses the $(WEB en.wikipedia.org/wiki/Kahan_summation,
std/algorithm/iteration.d:Kahan summation) algorithm.)
std/algorithm/iteration.d: return sumKahan!E(seed, r); std/algorithm/iteration.d:// Kahan algo http://en.wikipedia.org/wiki/Kahan_summation_algorithm std/algorithm/iteration.d:private auto sumKahan(Result, R)(Result result, R r)
$ _


Would one of the following solutions be fortunate ?

I. Use alias of fsum!(Summation. Appropriate) for floating version of std.algorithm.sum.

Appropriate algorithm performs D Pairwise summation for random access ranges. Otherwise performs D KBN summation of floating point and complex numbers and
    Kahan summation of user defined types.


II. Move this submodule to std.algorithm.iteration.


III. Remove Kahan (including KBN and KB2) and Pairwise algorithms from fsum, and use only Precise algorithm for std.numeric.

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