Agreed, but some of those features are quite useful. Allowing for tcl/lua-style "upvars" means that a whole class of macros no longer have to be written. I ofte

Agreed, but some of those features are quite useful. Allowing for tcl/lua-style "upvars" means that a whole class of macros no longer have to be written. I often wish it were more possible to extend the environment of an existing closure, as this would allow for real dynamic variables (as opposed to the hack that Scheme has now, which is actually terrible).