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    <h1>Variable casting.</h1>
    <h4>string(123) = "123"</h4>
    <h4>number("text") = NaN</h4>
    <h4>string("sold_books/book") = Ender's Game</h4>
    <h4>boolean("sold_books/book") = true</h4>
    <h4>boolean("") = false</h4>
    <h4>boolean(0) = false</h4>
    <h4>boolean(123) = true</h4>
    <h4>string(123/0) = Infinity</h4>
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