Unicode non-character being treat as space on Firefox/Chrome

[Gareth Heyes]

Hi all

Not sure if this is a bug or not. Non-character is being treated as a space
even though it's not defined as one. Edge and Safari treat it as an invalid
character.

```javascript
�alert�(1)�
```

In case the characters get mangled:
```javascript
eval("alert"+String.fromCharCode(65534)+"(1)");
```

Cheers
Gareth
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