[Haskell-beginners] Binary.Put and Double

I need to serialize an ieee compliant 64 bit floating point number, most often used as a Double in C. I'm guessing that the value I need to serialize is CDouble, but Put supports putWord64* . How do I convert Double to Word64 while ensuring that it is in the format of CDouble? Is this the right approach? If so, how is this done? -- We can't solve problems by using the same kind of thinking we used when we created them. - A. Einstein -- We can't solve problems by using the same kind of thinking we used when we created them. - A. Einstein