always add `children` and `attires` properties
always add `children` and `attires` properties

objects are now monomorphic (in terms of properties, not essentially
types)

simonfan/domhandler,BuildingJarl/domhandler,mail-apps/domhandler,fb55/domhandler,mail-apps/node-domhandler2,liuxiong332/node-domhandler2,fasterize/domhandler