RFR: 8251989: Hex formatting and parsing utility [v12]

[Daniel Fuchs]

On Tue, 1 Dec 2020 16:08:05 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> This is a private method, documented more than is usual.

Sorry - my comment was misplaced. I was mostly concerned with the *public* methods that follow.
(` public int fromHexDigits(CharSequence string)` and friends)
They all say that `* The delimiter, prefix and suffix are not used.` but they do not say anything about upperCase/lowerCase. Since this is normative specification doesn't it need to be fixed?

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PR: https://git.openjdk.java.net/jdk/pull/482