Fix type Float32Array type check in Utils

You can't do it like this. You have to use typeof, otherwise you get an undefined error.

```
Utils.ARRAY_TYPE = Float32Array || Array;
```

changed to:
```
if (typeof Float32Array !== 'undefined'){
  Utils.ARRAY_TYPE = Float32Array;
}else{
  Utils.ARRAY_TYPE = Array;
}
```