Page 701 (PDF page 739):
SECTION:
Combining futures: zip, Future.foldLeft, Future.reduceLeft,
Future.sequence, and Future.traverse
Page 739, 740
Still use TraversableOnce (not included in the Scala 2.13 collection
framework) rather then the right IterableOnce in this section.
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Fixed in 5ed. Tnx.
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