In Phil. 2:6, it is written,
ὃς ἐν μορφῇ θεοῦ ὑπάρχων οὐχ ἁρπαγμὸν ἡγήσατο τὸ εἶναι ἴσα θεῷ
Wiktionary lists the various declensions of the Greek adjective ἴσος. My question is, how is the word ἴσα declined according to (1) gender, (2) case, and (3) number, and what significance does this declension have with respect to the context of Phil. 2:6?