I don't have time to follow in detail this thread about changed behavior between versions. These observations are based on working with hundreds of code authors. I offer them as is. a. Nobody runs a serious numeric calculation without setting underflow-to-zero, in the hardware. You can't even afford the cost of software checks. Unfortunately there is no portable way to do that that I know of. b. Some people use Inf but most people want the code to STOP so they can find out where the INFS started. Otherwise, two hours later you have big arrays of Infs and no idea how it happened. Likewise sqrt(-1.) needs to stop, not put a zero and keep going.
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