m.callbacks[name] = callback
}

// Contains checks if the key is known to the map
func (m *MapValue) Contains(key ref.Val) ref.Val {
	v, found := m.Find(key)
	if v != nil && types.IsUnknownOrError(v) {
		return v
	}
	return types.Bool(found)
}

// Iterator returns an iterator to traverse the map.
func (m *MapValue) Iterator() traits.Iterator {
	return &iterator{parent: m, index: 0}
}

		objectType:  declType,
	}
}

// Contains returns whether the given key is contained in the MapValue.
func (m *MapValue) Contains(key ref.Val) ref.Val {
	v, found := m.Find(key)
	if v != nil && types.IsUnknownOrError(v) {
		return v
	}
	return celBool(found)
}

// ConvertToType converts the MapValue to another CEL type, if possible.
func (m *MapValue) ConvertToType(t ref.Type) ref.Val {
	switch t {

		elements = append(elements, next)
	}

	return &unstructuredList{elements: elements, itemsSchema: t.itemsSchema}
}

func (t *unstructuredList) Contains(val ref.Val) ref.Val {
	if types.IsUnknownOrError(val) {
		return val
	}
	var err ref.Val
	sz := len(t.elements)
	for i := 0; i < sz; i++ {
		elem := UnstructuredToVal(t.elements[i], t.itemsSchema)
		cmp := elem.Equal(val)
		b, ok := cmp.(types.Bool)