ool"></a>
    <a name="TPDAExtBool"></a>
    <p>Then we have an extended (but also 1-byte) boolean type, which knows 3
       different states. BTW, you can directly typecast a "boolean" value into a
       "TExtBool" value. A "false" will automatically be typecasted to a "no", and
       a "true" will automatically be typecasted to a "yes".</p>
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