Character Encoding

The JSON-B specification mentions "Instances of [...] java.lang.Character are serialized to JSON String values as defined within RFC 7159 Section 7 (Strings)". The RFC (https://tools.ietf.org/html/rfc7159#section-7) mentions that "All Unicode characters may be placed within the quotation marks, except for the characters that must be escaped: quotation mark, reverse solidus, and the control characters (U+0000 through U+001F)."

Now the problem is that there is a TCK test `BasicJavaTypesMappingTest#testCharacterMapping` that tests that Character.MAX_VALUE (= '\uFFFF') is escaped. U+FFFF falls outside of U+0000 through U+001F, so I assume that this character does not need to be escaped. Does that mean that the test is making a stronger assumption than necessary?

Read RFC 7159 Section 7 and the JSON-B wording, then inspect BasicJavaTypesMappingTest#testCharacterMapping. Determine whether requiring escaping U+FFFF is mandated; done means the issue has a documented resolution and the TCK expectation is aligned with the agreed interpretation.

Written by the indexing model from the issue text.