> It's a way to create global variables scoped to the current thread. That's not a global variable; that's a thread-scoped variable. (It's also not (really) m

> It's a way to create global variables scoped to the current thread. That's not a global variable; that's a thread-scoped variable. (It's also not (really) mutable. It gets initialized at the start of the scope and gets removed at the end of scope.)