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Encode supplementary characters in reserved URI template expansion - #1931
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Reserved ({+var}) and fragment ({#var}) expansion built a Rune from each
UTF-16 char, which throws for a surrogate half. Encode the full surrogate
pair as one UTF-8 scalar instead.
Fixes modelcontextprotocol#1913
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Fixes #1913
Reserved (
{+var}) and fragment ({#var}) expansion inUriTemplate.Encodebuilt aRunefrom each UTF-16char. For a surrogate pair (for example, an emoji), that throwsArgumentOutOfRangeException. On netstandard2.0 it didn't throw, but each half was encoded as U+FFFD. The encoder now encodes the full pair as one UTF-8 scalar.Tests: added
ReservedExpansion_EncodesSupplementaryUnicodeScalarcovering{+},{#}and mixed BMP/supplementary values. It fails without the fix and passes with it on net10.0, net9.0, net8.0 and net472.