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2.2.2 [ECMA-262/5] Section 8.5, The Number Type

C0008:

The specification states:

In some implementations, external code might be able to detect a difference between various Not-a-Number values, but such behaviour is implementation-dependent; to ECMAScript code, all NaN values are indistinguishable from each other.

IE9 Mode, IE10 Mode, and IE11 Mode (All Versions)

NaN values are not normalized to the same value.

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