Add string length tests for supplementary Unicode code points #52
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That is, code points outside the Basic Multilingual Plane (U+0000 to U+FFFF).
This will test that validators correctly account for the number of code points
inside strings, as required by RFC 7159, section 1:
A string is a sequence of zero or more Unicode characters [UNICODE].
Note that this citation references the latest version of Unicode
rather than a specific release. It is not expected that future
changes in the UNICODE specification will impact the syntax of JSON.
In order to keep it "easy" for storage, the UTF-16 escape sequence (as defined
by RFC 7159, section 7) is used to represent these characters. The chosen code
point is U+1F4A9 (yes, Unicode defines that):
http://www.fileformat.info/info/unicode/char/1F4A9/index.htm