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Because it is absent from GenTraversableOnce (yet not from TraversableOnce), reduceLeft does not seem to have a documentation string.
Yet, it is referred to directly in the documentation string of reduceLeftOption. To quote:
Optionally applies a binary operator to all elements of this collection or iterator, going left to right.
*return* an option value containing the result of reduceLeft(op) is this collection or iterator is nonempty, None otherwise.
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