fails:ObjectSpace.memsize_of returns 0 for true, false and nil
fails:ObjectSpace.memsize_of returns 0 for small Integers
fails:ObjectSpace.memsize_of returns an Integer for an Object
fails:ObjectSpace.memsize_of is larger if the Object has more instance variables
fails:ObjectSpace.memsize_of returns 0 for literal Symbols
fails:ObjectSpace.memsize_of returns a positive Integer for an Object
