call.
- this means that nested calls which use Lua in unrelated, black boxed
ways (and so don't pass around an *L) don't share a stack; when you
Get a new state, you're guaranteed an empty stack, and like function
dispatches, you can use absolute stack indexes starting from 1
- we don't have to track stack counts to sanity check it; it always starts
at 0, so just check that the stack is empty again on Release
- we maintain a pool of states, so Get() is still fast; we typically create
only a couple states
Glenn Maynard
82233e2ae7