This seems like it could be a pretty valuable tool, but what about objects
that implement valueOf() specifically so arithmetic can be performed on them
(such as Date)? This is something restricter doesn't currently allow, but
appears as though it would be extremely valuable, at least in the case that
the two operands have the same constructor:
var date1 = new Date(2011, 2, 5),
date2 = new Date(2011, 2, 1),
time = date1 - date2,
days = time / (1000 * 60 * 60 * 24);
console.log(days.toString(10) + " days");
"restricter mode" code will throw an exception for date1 - date2. Obviously
you *could* do:
time = date1.valueOf() - date2.valueOf();
but that seems like throwing away a great convenience that the language
gives you.
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