// Writes a scalar value as a percent-encoded sequence of UTF8 bytes, per RFC 3987.
protected override void WriteEncodedScalar(ref Writer writer, uint value)
{
uint asUtf8 = (uint)UnicodeHelpers.GetUtf8RepresentationForScalarValue(value);
do
{
char highNibble, lowNibble;
HexUtil.ByteToHexDigits((byte)asUtf8, out highNibble, out lowNibble);
writer.Write('%');
writer.Write(highNibble);
writer.Write(lowNibble);
} while ((asUtf8 >>= 8) != 0);
}