RFR: 8260265: UTF-8 by Default [v3]

[Naoto Sato]

On Wed, 14 Jul 2021 21:03:53 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

>> That was intentional. Only those two are supported, others continue to work as before (but not supported).
>
> Still it leaves an uncomfortable feeling, perhaps remedied by an "other values have unspecified behavior"
> or the "other values are implementation specific".

Added the clarifying sentence to the spec.

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PR: https://git.openjdk.java.net/jdk/pull/4733