add type annotation
add type annotation

wallymathieu/FsPickler,wallymathieu/FsPickler,cloudRoutine/Unity3d.FsPickler,mbraceproject/FsPickler,FsUnity/Unity3d.FsPickler,nessos/FsPickler,FsUnity/Unity3d.FsPickler,haraldsteinlechner/FsPickler,nessos/FsPickler,cloudRoutine/Unity3d.FsPickler,haraldsteinlechner/FsPickler