This does not assign the pointer of rhs to this RefRange.
Rather it assigns the range pointed to by rhs to the range pointed
to by this RefRange. This is because any operation on a
RefRange is the same is if it occurred to the original range. The
one exception is when a RefRange is assigned null either
directly or because rhs is null. In that case, RefRange
no longer refers to the original range but is null.
This does not assign the pointer of rhs to this RefRange. Rather it assigns the range pointed to by rhs to the range pointed to by this RefRange. This is because any operation on a RefRange is the same is if it occurred to the original range. The one exception is when a RefRange is assigned null either directly or because rhs is null. In that case, RefRange no longer refers to the original range but is null.