In addition to marking the P argument on the verb, a language may also encode the number of the object, as in Tundra Nenets (1a-b). This question maps languages, where such agreement is possible.

(1) Tundra Nenets

a. xadaəda
xadaə-da
kill-3SG>SG.OBJ
‘He killed him/her’

b. xadaŋaxəyuda
xadaŋa-xəyu-da
kill-DU.OBJ-3SG
‘He killed them two’
(Nikolaeva 2014:80)

By comparison, in Hungarian, irrespective of the number of the object, the 1Sg personal ending in the definite conjugation is -m (2). Thus, Hungarian is coded as '0'.

(2) Hungarian
Elolvastam a könyvet / a könyveket
el-olvas-t-am a könyv-et / a könyv-ek-et*
PFX-read-PST-1SG.DEF DEF.ART book-ACC / DEF.ART book-PL-ACC
'I read the book / the books'

Coding

The value is ‘1’ if there is a way to mark the number of the object on the main verb (as in Tundra Nenets). If no such distinction can be made, the value is '0' (as in Hungarian).