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Issue	Fix Version	Assignee	Priority	Status	Resolution	Resolved In Build
JDK-8312907	21.0.1	Stuart Marks	P3	Resolved	Fixed	b04
JDK-8311977	21	Stuart Marks	P3	Resolved	Fixed	b32

https://download.java.net/java/early_access/jdk21/docs/api/java.base/java/util/Deque.html#reversed()
"Implementation Requirements:
The implementation in this interface returns an instance of a reverse-ordered Deque that delegates its operations to this Deque."

The phrase - "delegates its operations to this Deque." one might interpret this the delegation is 'x' to 'x' ( reversedeque.addFirst() ---> deque.addFirst() )
Actual delegation is -> reversedeque.addFirst() ---> deque.addLast()

====
Similar case for - https://download.java.net/java/early_access/jdk21/docs/api/java.base/java/util/SortedMap.html#reversed()

Similar case for - https://download.java.net/java/early_access/jdk21/docs/api/java.base/java/util/SortedSet.html#reversed()

Do we need to clarify the spec here?

backported by

JDK-8311977 Clarify reversed() default methods' implementation requirements

JDK-8312907 Clarify reversed() default methods' implementation requirements

blocks

JDK-8280836 JEP 431: Sequenced Collections

csr for

JDK-8311845 Clarify reversed() default methods' implementation requirements

links to

Commit openjdk/jdk21/f6ad56bc

Commit openjdk/jdk/f82c8184

Review openjdk/jdk21/115

Review openjdk/jdk/14504

(3 links to)