Internal class names not minificated after release build

[KvanTTT]

I have next source code (C#):

namespace Module1
{
    internal class InternalClass1 { }
}

And generated release code (JavaScript):

define("Module1", ["ss"], function (n) {
    function t() {}
    var r = this;
    return n.module("Module1", {
        InternalClass1: [t, {},
            null
        ]
    }, null)
})

Name of InternalClass1 should be minified.