Hello Brian,
I like this development, the only thing that makes me wary is the implied TLS behavior. I think I'd personally prefer it if tls was a keyword as well, and all globals had to have either tls or shared (or __gshared) in their type, rather than defaulting to tls if none is specified. So we'd force the programmer to explicitly define the level of sharing.
I'm fine with the implicit but I'd like to see the explicit form as well (so they wouldn't pop up from -vtls).
