Why does IE nuke window.ABC variables?

When running the following block of code, FF and Chrome output typeof(hiya) = string while IE7/8 output typeof(hiya) = undefined.

<html>
    <body>
        <script type="text/javascript">
            window.hiya = 'hiya';
        </script>
        <script type="text/javascript">
            if( false ) {
                var hiya = 1;
            }
            document.write( "typeof(hiya) = "+ typeof(hiya) );
        </script>
    </body>
</html>

Each of the following makes the problem go away:

Combining everything into a single <script> block.
Removing the if block.
Renaming var hiya = 1 to var hiya2 = 1.
Renaming var hiya = 1 to window.hiya = 1.
Renaming var hiya = 1 to hiya = 1.

What is happening? Is there a scoping bug in IE?

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Why does IE nuke window.ABC variables?

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