indexWhere should return Option[Int], this -1 business is ridiculous
indexWhere should return Option[Int], this -1 business is ridiculous

for #9304

arex1337/lila,arex1337/lila,luanlv/lila,arex1337/lila,luanlv/lila,arex1337/lila,luanlv/lila,luanlv/lila,arex1337/lila,luanlv/lila,luanlv/lila,arex1337/lila,luanlv/lila,arex1337/lila