Optimising RemGlk-rs

[Dannii]

@cas

I’ve long pondered swapping Bocfel to the MIT license. That obviously won’t help the size issue, but if I can unstick at least one issue, I’m not wedded to the GPL.

This really wasn’t at all intended to prompt you to do that, but if you did decide to I wouldn’t complain!

@Hanna

As for the wasm size, I think at least half of that is due to the Glk library, not the interpreter per se. Comparing the wasm file sizes of emglken 0.6 (using C RemGlk) vs. 0.7 (switched to remglk-rs), the Bocfel wasm went from 1.13 MB to 2.3 MB. Other interpreters grew by different amounts but the general trend is clear.

Yes there are lots of potential size cuts that could be made to RemGlk-rs. Some things you mentioned like Serde may be large, but I think the benefits way outweigh the size cost, the easy and safety is just too good.

RemGlk-rs doesn’t use wasm-bindgen, but maybe Emscripten uses the same metadata section you found?

One other big thing is the unicode data tables. I think they’d be up to several hundred KB, however I think Bocfel doesn’t include them so it wouldn’t help here.