ID:1843123
 
(See the best response by Super Saiyan X.)
Anyone knows what's the position of in operator at order of operations?
Best response
It's not documented in the guide or reference's order of operations list, so it has the lowest aside from the to and step keywords.
It's quite low. Eventually I'd like to change that, but the way priority is handled in the parser makes it difficult to change, so it's been on the back burner.

Your best bet when using the in operator is to use parentheses around the expression.