Théophile Batoz authored Aug 26, 2020 and Marge Bot committed Sep 12, 2020

zipToUFM is a new function to replace `listToUFM (zipEqual ks vs)`.
An explicit recursion is preferred due to the sensible nature of fusion.

    T12227 -6.0%
    T12545 -12.3%
    T5030  -9.0%
    T9872a -1.6%
    T9872b -1.6%
    T9872c -2.0%

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