Class Library: Object - performance improvements for Object.dup 

before:
bench{
 10.do({
   nil.dup(1000000)
 })
} // time to run: 2.6241684029992 seconds.

after:
 bench{
   10.do({
   nil.dup(1000000)
 })
} // time to run: 1.5116338950011 seconds.