In the execution phase, their behavior is different.
section 12.2
http://ecma-international.org/ecma-262/5.1/#sec-12.2
var arguments = undefined
performs PutValue with reference and undefined.
1. Let lhs be the result of evaluating Identifier as described in 11.1.2.
> 2. Let rhs be the result of evaluating Initialiser.
> 3. Let value be GetValue(rhs).
> 4. Call PutValue(lhs, value).
> 5. Return a String value containing the same sequence of characters as in
> the Identifier.
But
var arguments;
doesn't perform any assignment.
1. Return a String value containing the same sequence of characters as in
> the Identifier.
Regards,
Yusuke Suzuki
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