Variadic function not recognizing static array length

[Zach the Mystic]

void func(string[2] a) {}

void func2(T...)(T args) {
    static assert(is(typeof(args[0]) == string[2]));
}

void func3(T...)(T args) {
    static assert(args[0].length == 2);
}

func(["",""]); // Okay
func2(["",""]); //  Error: (is(string[] == string[2LU])) is false
func3(["",""]); // Error: _param_0 cannot be read at compile time

Is this the intended design? Is there a workaround which allows 
me to ensure that the parameter is exactly 2 length?