The example is:

ZnPercentEncoder new decode: 'Neuqu��n, Neuqu��n Province, Argentina'

 

The IETF standard  provides these definitions:

https://www.ietf.org/rfc/rfc3986.txt

https://tools.ietf.org/html/std63

 

 the implementation   ZnPercentEncoder, decode: stringStream to: byteStream could be changed to accept characters below 256. (char charCode < 256 instad of char charCode < 128)?

 

decode: stringStream to: byteStream

            | char |

            self decodePlusAsSpace.

            [ stringStream atEnd ]

                       whileFalse: [

                                   ((char := stringStream next) == $+ and: [ decodePlusAsSpace ])

                                               ifTrue: [ byteStream nextPut: 32 ]

                                               ifFalse: [

                                                          char == $%

                                                                      ifTrue: [ byteStream nextPut: (self readHexFrom: stringStream) ]

                                                                      ifFalse: [

                                                                                  char charCode < 128

                                                                                             ifTrue: [ byteStream nextPut: char charCode ]

                                                                                             ifFalse: [ self errorAsciiCharacterExpected ] ] ] ]