That's actually wrong.
typeof 1
"number"
typeof new Number(1)
"object"
1 instanceof Number
false
new Number(1) instanceof Number
true
But it's true however that GWT does not make any distinction between a
"Number value" and a "Number object", because in practice it doesn't matter
much (it only matters if you use the typeof or instanceof operators, or when
some browsers are buggy –such as Firefox throwing for foo[new String("bar")]
whereas foo["bar"] is OK–)
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