Fix encoding of JSON surrogate pairs
JSON requires that such pairs be treated as UTF-16 surrogate pairs, not individual code points; cf. Bug #24784. * lisp/json.el (json-read-escaped-char): Fix decoding of surrogate pairs. (json--decode-utf-16-surrogates): New defun. * test/lisp/json-tests.el (test-json-read-string): Add test for surrogate pairs.
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