Inconsistent safe cast behavior

[John Hattan]

Just had an odd runtime exception with my stuff on HTML5 with safe casts. Here's a minimum case. . .

class Foo

{

}

var foo1:Foo = null;

var foo2:Foo = cast(null, Foo);

The first one works fine on everything. The second works on everything (I've tried) but Javascript, which throws a "cannot cast" runtime error.

IMHO, both should should be okay and equivalent, as a "value null of type class Foo" in both cases.