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59: add support for \uXXXX escapes within string literals
This is in response to edn-format/edn#65 . This is an extension as string literals as currently documented do not specify support for \uXXXX escapes. https://github.com/edn-format/edn/tree/a51127aecd318096667ae0dafa25353ecb07c9c3 Notes: - Unicode escape must begin with "\u". This is case sensitive "\U" will be rejected. - "\u" must be followed by exactly four hex digits taken from this set: 0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F - The digits are not case sensitive. - Each such Unicode escape encodes a single 16-bit Java char. Since Java uses UTF-16 internally (for historical reasons) code points beyond the basic multilingual plane as a pair of unicode escapes. (see also "surrogate pairs")
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