<p>How can I convert an <code>Int64</code> to an <code>Int32</code> type in F# without using the <code>Microsoft.FSharp.Compatibility.Int32.of_int64</code>?</p>

<p>I'm doing this because interactive doesn't seem to work when I try:</p>

<pre><code>open Microsoft.FSharp.Compatibility
</code></pre>

<p>With <code>FSharp.PowerPack</code> added as a reference it says: </p>

<blockquote>
  <p>error FS0039: The namespace 'Compatibility' is not defined.</p>
</blockquote>

<p><strong>Edit:</strong> Does anyone have an answer to the question?  The suggestions about the int types are useful and informative, but I'm having the same issue opening the powerpack namespace in F# interactive.</p>

F# 1.9.6 has a type conversion function so you can do this:
```
```
let num = 1000
let num64 = int64(num)
```
```