I'm currently working through level 4 of Fluenz Spanish. In session 26, "to invite him" is translated as "invitarle". It's my understanding that the verb invitar (as in to invite someone) takes a direct object. Therefore, shouldn't "to invite him" be "invitarlo"? I understand that invitar requires the personal "a", but so do lots of other transitive Spanish verbs that take direct object pronouns, i.e. lo/la and los/las.