Membership test does not work with objects

[ghewgill]

> VAR x: Object := 4
> VAR a: Array<Object> := [3, 4, "foo"]
> x IN a
FALSE

[ghewgill]

This gets deeper.

> a := [1, 2, x]
> x IN a
FALSE
> a := [1, "two", x]
> x IN a
TRUE

The problem here is that in the first case, the literal array is resolved to type "array of number", because every array element can be converted to Number. So although a is declared as Array<Object>, the literal array starts off as Array<Number> and then is converted to Array<Object>.

In the second case, the literal array is resolved as "array of object" because the types are different. So the identity of x remains the same in the array and x IN a is true.