Fix immutable field annotation
Fix immutable field annotation

magnusmorton/pycket,pycket/pycket,pycket/pycket,cderici/pycket,pycket/pycket,magnusmorton/pycket,magnusmorton/pycket,cderici/pycket,cderici/pycket,samth/pycket,samth/pycket,samth/pycket