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jsdouble is a C floating-point number type. It is defined to be a 64-bit, IEEE 754 compliant type. See ECMA 262-3 §8.5. Arithmetic on
Implementation note: SpiderMonkey has had several bugs involving details of floating-point arithmetic on various platforms. Controlling the behavior of floating-point arithmetic is very architecture- and system-specific, and can be hard to get right. Help in the form of test cases, commentary, and patches is always appreciated.