Is utf-8 characters intentional ?

Testing a json parser that do not manage utf-8 characters I found that this grammar has some that I'm not sure it's intentional:
```
"value": "–>"  ///verilog
"value": "->"  ///cpp do not uses utf-8
...
"value": "–"  ///verilog
"value": "––"  ///verilog
"value": "[–>"  ///verilog
```