Sequenced Collections in Java

A small but overdue fix to the Java collections API: a common SequencedCollection interface that finally gives every ordered collection — List, LinkedHashSet, LinkedHashMap — first/last element access and a reversed view, without the inconsistent workarounds we've all written over the years. Not a headline feature, but exactly the kind of quality-of-life change that quietly removes a class of bugs and boilerplate from day-to-day Java code. Worth five minutes if you touch Java collections regularly and haven't caught up on 21.

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