This is an internal property that describes the class that a Number object instance is a member of. The reserved words suggest that in the future, this property may be externalized.
See also: | Class, Number object |
ECMA 262 edition 2 - section - 8.6.2
ECMA 262 edition 2 - section - 15.7.2.1
ECMA 262 edition 3 - section - 8.6.2
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