First, congrats! Seems like an important milestone, even if there's much to be done ahead.
Second, what does arc in Nim mean for us mortals? Will compiling or running programs become faster? Will we have to use a different mechanism to get type information now that typeinfo is unavailable with arc? Is this information going to be different? Will we have to use new language constructs like sink and lent, whatever they mean? Is this a huge change for Nim under the hood or is just yet another gc option? Thanks, and Merry Christmas!
