1D2 is a version of scientific notation, 1 times 10 to the 2nd power. Try 1.234D3. Try an E instead of a D, too.
Int doesn't like any of the scientific notation formats, but Float does. That's intentional, so far as I know. Scientific notation and Float are both meant to be non-precise numeric approximations, while Int is meant to be exact.
Why a hyphen does what you found, I'm not sure. But the two conversion engines do look to me like they were built by different developers, and it may be as simple as that.
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