THEORY: Ergativity and polypersonalism

Hi,

Studying materials about ergativity for my new project, I found an
interesting tendency. If the lang has ergativity, it usually has a
polypersonal verb, that is a verb form explicitly denotes person and number
of both subject and object. I found this in Basque, Georgian, Koryak and
Chukchi. Is it as much universal, or you can show me examples of natlangs
that have ergativity without a polypersonal verb?

Thank you in advance.

-- Yitzik

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