STC: non ambiguous constructor reference when subclass is used

import groovy.transform.*

class Expr {}
class VarExpr extends Expr {}

class TupList {
    TupList(Expr e1) {}
    TupList(Expr[] es) {}
}

class ArgList extends TupList {
    ArgList(Expr e1) { super(e1) }
    ArgList(Expr[] es) { super(es) }
}

@TypeChecked
class Bug4 {
    void test() {
        new ArgList(new VarExpr())
    }
}

new Bug4().test()

[Static type checking] - Reference to method is ambiguous. Cannot choose between [MethodNode@745724997[void <init>(Expr)], MethodNode@685460687[void <init>(Expr[])]]
 at line: 19, column: 9