Guillaume is making an excellent point here. (Reposted below with his permission.)

(To paraphrase him,) I suggest that https://github.com/feeley/gambit/pull/180 should be included because it's reasonable that users should be able to implement their own hash-sequence extensions.

We don't need to make a bigger philosophical deal about it than that. This is low-level.

Also I think all reasonable uses will be about data and not code, and therefore they will not need any line numbering or similar info, so the unwrapping is fine - or easy access to an unwrapping routine (you choose). So finally perhaps the only thing would be to give it a better name, if you want that.

Please let me know if-when it can be included in Gambit :D

Thanks!!


2016-02-24 21:04 GMT+07:00 Guillaume Cartier <gucartier@gmail.com>:
Hi Adam,

I think the main thing I'd say is that from my experience, waiting for Marc to integrate something into Gambit so as "not to use undocumented features", you will wait a long time :) I'd say don't worry too much about using undocumented stuff. I think it is actually a wonderful feature that Gambit exposes its internal stuff, where in many languages you just don't have any access to internals. JazzScheme uses what I'd say is a "healthy" mix of mostly documented features and various undocumented features.

One reason I say you'll be waiting a long time is that a big design goal in Gambit is to *not* go into unclear how best to implement high-level features. In this Marc is really in-tune with the old R5RS philosophy, which is kinda obvious since he was on the committee :) Regarding that, I think Marc should include the low-level part of your code to implement #\ extensions even if he feels the higher level stuff is unclear.

Cheers,
Guillaume

On Mon, Feb 22, 2016 at 4:29 PM, Adam <adam.mlmb@gmail.com> wrote:
Dear Guillaume,

I trust you are well -

if you have any thoughts about the sexp extension ML topic right now feel free to tell there,

Thanks :)