Data.List.minimumBy :: Foldable t => (a -> a -> Ordering) -> t a -> a

    https://www.stackage.org/haddock/lts-12.1/base-4.11.1.0/Data-List.html#v:minimumBy

but there are many cases where that's quite unhelpful.  Actually what we
want is more like

    minimumsBy :: ... => (a -> a -> Ordering) -> t a -> [a]

There can be many distinct minimizers.  For example when I want to get the
collection of the youngest people from [(Age, Person)] I want

    minimumsBy (compare `on` fst) [(12, alice), (15, balaji), (12, cho)]

to return

    [(12, alice), (12, cho)]

Does "minimumsBy" exist somewhere reasonably standard?  Hoogle doesn't throw
up anything obvious

    https://www.stackage.org/lts-12.1/hoogle?q=%28a+-%3E+a+-%3E+Ordering%29+-%3E+t+a+-%3E+%5Ba%5D

Thanks,

Tom
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