> I disagree with isatty() sensitivity.

Fair enough.

> The whole reason we distinguish
> between programs and scripts (though the word "script" doesn't appear in
> R7RS, they are described) is to allow both cases to work independent of
> the source of input.

By "script" here, you mean REPL, right?

That's a further confusion since "script" in Unix parlance (and probably
Windows as well) means a program coming from a file. Which I guess is
"program" in R7RS parlance.