Mutually recursive types and aliases don't seem to compile

[Dimension4]

Hey,

I'm trying to implement a simple json parser to learn the language. It seems koka has problems compiling mutually recursive types if one of them is an alias. The following results in a very long compiler error, boiling down to "type jobject not found":

rec type jvalue
    Null
    True
    False
    Number(x: float64)
    String(x: string)
    Array(x: list<jvalue>)
    Object(x: jobject)

alias jobject = list<(string, jvalue)>

If I inline jobject into the Object constructor, or define it as

struct jobject
    obj: list<(string, jvalue)>

it compiles fine. Is this a compiler bug or a limitation of aliases?