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If the argument is 0x7f80000000000000L, the result is positive infinity.
If the argument is 0xff80000000000000L, the result is negative infinity.
If the argument is any value in the range 0x7ff0000000000001L through 0x7fffffffffffffffL or in the range 0xfff0000000000001L through 0xffffffffffffffffL, the result is NaN. All IEEE 754 NaN values are, in effect, lumped together by the Java language into a single value.