func fieldsHasShape(fields []*Field) bool {
	for _, f := range fields {
		if f.Type != nil && f.Type.HasShape() {
			return true
		}
	}
	return false
}

// newBasic returns a new basic type of the given kind.
func newBasic(kind Kind, obj Object) *Type {
	t := newType(kind)
	t.obj = obj
	return t
}

// NewInterface returns a new interface for the given methods and