TST: convert `original` explicitly to native byteorder for pickle, from_class
TST: convert `original` explicitly to native byteorder for pickle, from_class

Co-authored by: Marten van Kerkwijk <mhvk@github.com>

StuartLittlefair/astropy,larrybradley/astropy,mhvk/astropy,saimn/astropy,astropy/astropy,larrybradley/astropy,lpsinger/astropy,astropy/astropy,saimn/astropy,mhvk/astropy,lpsinger/astropy,StuartLittlefair/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,saimn/astropy,pllim/astropy,lpsinger/astropy,larrybradley/astropy,astropy/astropy,lpsinger/astropy,StuartLittlefair/astropy,larrybradley/astropy,aleksandr-bakanov/astropy,aleksandr-bakanov/astropy,pllim/astropy,pllim/astropy,saimn/astropy,mhvk/astropy,larrybradley/astropy,mhvk/astropy,pllim/astropy,astropy/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,astropy/astropy,StuartLittlefair/astropy,saimn/astropy,mhvk/astropy,pllim/astropy