Name internal type parameter

Author: gusty

src/FSharpPlus/Operators.fs

@@ -157,13 +157,15 @@ module Operators =
     /// To be used in pipe-forward style expressions
     /// </summary>
     /// <category index="1">Functor</category>
-    let inline (|>>>) (x: '``Functor1<Functor2<'T>>``) (f: 'T -> 'U) : '``Functor1<Functor2<'U>>`` = (Map.Invoke >> Map.Invoke) f x
+    let inline (|>>>) (x: '``Functor1<Functor2<'T>>``) (f: 'T -> 'U) : '``Functor1<Functor2<'U>>`` =
+        (Map.Invoke >> (Map.Invoke: ('``Functor2<'T>`` -> '``Functor2<'U>``) -> _)) f x
 
     /// <summary>
     /// Lifts a function into two Functors.
     /// </summary>
     /// <category index="1">Functor</category>
-    let inline (<<<|) (f: 'T -> 'U) (x: '``Functor1<Functor2<'T>>``) : '``Functor1<Functor2<'U>`` = (Map.Invoke >> Map.Invoke) f x
+    let inline (<<<|) (f: 'T -> 'U) (x: '``Functor1<Functor2<'T>>``) : '``Functor1<Functor2<'U>`` =
+        (Map.Invoke >> (Map.Invoke: ('``Functor2<'T>`` -> '``Functor2<'U>``) -> _)) f x
 
     /// <summary>
     /// Like map but ignoring the results.