[#1D29EE576F75F55B5F2E430D0788BEB76AD7E818]
Return the string with percent-decoding
templateStringToken::result_type decode( encoding_opts opt = = {}, StringToken&& token) const;
This function converts percent escapes in the string into ordinary characters and returns the result. When called with no arguments, the return type is `std::string`. Otherwise, the return type and style of output is determined by which string token is passed.
assert( pct_string_view( "Program%20Files" ).decode() == "Program Files" );
Linear in `this->size()`.
Calls to allocate may throw. String tokens may throw exceptions.