anchor.diff:        RuntimeVersion = null
         ReportDirectory = null 
         ReportNameFormat = null 
  -      Filters = null }
  +      Filters = null
  +      ReportArchive = None }
   
   let inline private addProperties properties propertyContainer =
       properties
  
positive.code: open Gallio.Model
  open Gallio.Model.Filters
  open FSharp.Nullable
  
  type GallioParams = 
        /// Sets whether to load the tests but not run them.
  
negative.code:         project.ReportDirectory <- param.ReportDirectory
      if param.ReportNameFormat <> null then
          project.ReportNameFormat <- param.ReportNameFormat
      match param.ReportArchive with
      | None -> ()
      | Some v -> 
          project.ReportArchive <- 
              match v with
              | Normal -> ReportArchive.Normal
              | Zip -> ReportArchive.Zip
  
      project
  
  let private createExecutionOptions param = 
  