Speed up deep copy of fields
Speed up deep copy of fields

marshmallow-code/marshmallow,mwstobo/marshmallow,Tim-Erwin/marshmallow,xLegoz/marshmallow,0xDCA/marshmallow,daniloakamine/marshmallow,etataurov/marshmallow,Bachmann1234/marshmallow,maximkulkin/marshmallow,bartaelterman/marshmallow,VladimirPal/marshmallow,quxiaolong1504/marshmallow,0xDCA/marshmallow,jmcarp/marshmallow,dwieeb/marshmallow,jmcarp/marshmallow