Ah, I see, this is a tcl/L rough edge. It turns out that tcl has a [flush $file] call. Since tcl/L calls can be mixed and since we use the same data structures where possible, the following do the same:
There is a lot of useful functionality in tcl that we didn't see the need to replicate. That may be the wrong answer, but it's always worth wandering around the tcl/doc directory and looking at those functions.
Other than wrapping everything in C/stdio compat interfaces, dunno what to do. It's true that knowing some tcl definitely makes you more productive in L. I tend to use L for systems stuff, like where I'd use perl or awk, and most of that stuff is there.
I guess I'd say be noisy and we'll look at greasing the squeaky wheel
BTW, there was a bug in notifications so we didn't see this thread right away, we fixed it.