Cannot use tinyint data type

I have a column of type `tinyint`, I'd like to use. However when I do a prepared insert using the `PhpInt` type, I get an error from Cassandra:

```
Invalid: Expected 1 byte for a tinyint (4)
```

There doesn't seem to be a TinyInt type, so is there a correct way of doing this or am I missing something?

Thanks!
