anchor.diff:                          then None
                           else Some(Array.averageBy Option.get window))
   
  +/// Extensions for F#'s List module.
   module List =
       /// Curried cons
       let inline cons hd tl = hd::tl
  
positive.code: open System.Runtime.CompilerServices
  open FSharpx
              
  module Seq =
      /// <summary>
      /// Adds an index to a sequence
  
negative.code: 
  [<CompilationRepresentation(CompilationRepresentationFlags.ModuleSuffix)>]
  [<Extension>]
  /// Extensions for NameValueCollections.
  module NameValueCollection =
      open System.Collections.Specialized
      open System.Linq
  