When a fn doesnt' have all it's args, it gets curried - the pipe puts it at the end, as you say, to take advantage of this fact.
If you want the arg to go in first, then use a lambda or a local named fn to re-arrange things. E.g.:
let inline fn' a b c = fn c b a
let y = x |> foo |> fn' 1 2 |> bar
Of course, you can use the same name as the orig fn. if you want, in the scope of the let.
Thanks. Also I have found succinct way of doing this,- it involves currying :-)
(firstArg |> func) secondArg
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Some interesting question - How to define operator which pipes given value into given function FIRST parameter ? (not LAST, as it does pipe |> operator). Is is posible at all ? Any answers ? :-))