e fold of the parts of a structure that are viewed through a 'Lens', 'Getter', 'Fold' or 'Traversal'.
--
-- @
-- 'Data.Foldable.foldl' ≡ 'foldlOf' 'folded'
-- @
--
-- @
-- 'foldlOf' :: 'Getter' s a     -> (r -> a -> r) -> r -> s -> r
-- 'foldlOf' :: 'Fold' s a       -> (r -> a -> r) -> r -> s -> r
-- 'foldlOf' :: 'Lens'' s a      -> (r -> a -> r) -> r -> s -> r
-- 'foldlOf' :: 'Iso'' s a       -> (r -> a -> r) -> r -> s -> r
-- 'foldlOf' :: 'Traversal'' s a -> (r -> a -> r) -> r -> s -> r
-- 'foldlOf' :: 'Prism'' s a     -> (r -> a -> r) -> r -> s -> r
-- @
foldlOf :: Getting (Dual (Endo r)) s a -> (r -> a -> r) -> r -> s -> r
foldlOf l f z = (flip appEndo z .# getDual) `rmap` foldMapOf l (Dual #. Endo #. flip f)
{-# INLINE foldlOf #-
foldlOf :: Getting (Dual (Endo r)) s a -> (r -> a -> r) -> r -> s -> r
foldlOf l f z = (flip appEndo z .# getDual) `rmap` foldMapOf l (Dual #. Endo #. flip f)
foldlOf l f z = (flip appEndo z .# getDual) `rmap` foldMapOf l (Dual #. Endo #. flip f)