RFR: 8307840: SequencedMap view method specification and implementation adjustments

[Joe Darcy]

On Thu, 1 Jun 2023 16:18:12 GMT, Stuart Marks <smarks at openjdk.org> wrote:

> Adjust the specification of the `SequencedMap` sequenced-view methods, and adjust implementations to match.

Marked as reviewed by darcy (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/14267#pullrequestreview-1464266624