o1.prop changed
  o1.prop: a
  p: prop,a,b,
Set to c, returning d
  o1.prop: c
Done
  o1.prop: d
o2.prop changed
  o2.prop:
  p: prop,,b,
Set to c, returning d
  o2.prop: c
o2.prop setter
  p: d,
Done
o2.prop getter
  p: ,
  o2.prop: e
