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For Internet Explorer the second arg of Function.apply()
must be either Array or truly undefined

Whereas Firefox and Chrome (webkit) accepts undefined as value, and null.

• click here

Code

var o1 = { func : function(key, value) { 
        if(key !== undefined) {
            this[key] = value;
            log("set: " + key + "=" + this[key]);
        }
        else {  log("did nothing");  }
    }
},
o2 = {},
doApply = function() {
    o1.func.apply(o2, ["someKey", "someValue"]);
    try {  o1.func.apply(o2, []);  }
    catch(er) {  log("failed when second arg empty array");  }
    try {  o1.func.apply(o2);  }
    catch(er) {  log("failed when no second arg at all (truly undefined)");  }
    try {  o1.func.apply(o2, undefined);  }
    catch(er) {  log("failed when second arg undefined (undefined as value)");  }
    try {  o1.func.apply(o2, null);  }
    catch(er) {  log("failed when second arg null");  }
    try {  o1.func.apply(o2, 0);  }
    catch(er) {  log("failed when second arg zero");  }
};