Property "enctype" is not understood by IE8

```JS
f  = document.createElement('form');
f.enctype = 'multipart/form-data';
console.log(f.enctype);
console.log(f.encoding);
console.log(f.getAttribute('enctype'));
```

Outputs (on IE8):

```
LOG: multipart/form-data
LOG: application/x-www-form-urlencoded
LOG: application/x-www-form-urlencoded
```

Whereas with `f.setAttribute('enctype', 'multipart/form-data');`:

```
LOG: multipart/form-data
LOG: multipart/form-data
LOG: multipart/form-data
```

Super unlikely that anyone would ever bump into this, but it is super-weird if you would and it's pretty much free so why not.