Slava authoritatively states in this post that Reg Braithwaite authoritatively states on his weblog that programmers switching to Factor must relinquish their local variables. In fact, Reg Braithwaite was not authoritative because Factor supports lexically scoped local variables via the locals vocabulary, which in turn means that Slava was not authoritative in claiming that Reg Braithwaite was an authority on Factor.
In other words, I was wrong :-)