Detail #160: A Quirk in Plurality Congruence for Objects

Consider a language with some kind of number congruence for objects on the verb. Let's add a few quirks:

The indirect object is considered an object too for this purpose.

This would mean that 'I gave him a book' has plural congruence, since the number of objects is greater than one.

Let us assume there's no pro-drop in the language. Now, plural reciprocals and reflexive verbs simply obtain reflexivity by plural congruence:

they saw.PLUROBJ = they saw each other or themselves