Duktape VS nitter

Im my projects I search for single file libs.(like https://github.com/svaarala/duktape etc...)

Use lrand48(), or better, implement a high-quality RNG like PCG or splitmix64.

You can also refer to the Unicode routines of other small JS engines[1,2], those don’t use ICU either, although the implementations are mercilessly size-optimized (to put it politely) and restricted to what the target JS version requires (e.g. casemapping but no normalization).

[1] https://github.com/bellard/quickjs/blob/master/libunicode.c

[2] https://github.com/svaarala/duktape/blob/master/src-input/du...

> memcpy from bytes to a NaN should work fine

Signaling NaNs are explicitly undefined in C11 F.2.1.: "This specification does not define the behavior of signaling NaNs." - and in practice may be "quieted" by conversion to Quiet NaNs, changing their bit patterns. Fast math optimization flags will also break the hell out of your code by assuming NaNs are impossible. I want to say there are more circumstances where optimizers and compiler generated code can butcher your NaN payloads, but I'd be working off recollected hearsay and I can't find a source, so don't quote me on that.

NaN boxing is common enough that, if you take the right precautions, a modern compiler should probably support it, maybe. NaN boxing is uncommon enough that, if your codebase needs to be sufficiently portable, you need an opt out for when it breaks. Let's review duktape's scars:

https://github.com/svaarala/duktape/blob/123d9426d5e5b36d5da...

https://github.com/svaarala/duktape/blob/5252b7a50611a3cb8bf...

https://github.com/svaarala/duktape/blob/224a0b89ca08a36e37e...

Note that "the right precautions" involve unions and proper integer types to avoid optimizer-invoked rewrites of the value and debugging when things go wrong, not simply YOLOing bytes into a double via memcpy. Note that debugging when it all goes terribly wrong can be quite painful. I've personally had the misfortune of being forced to debug duktape being built with fast math optimizatoins enabled on one "rare" platform + build configuration that wasn't caught by duktape's #if defined(__FAST_MATH__) checks linked above (wasn't Clang nor GCC, so go figure it didn't make the same #define)

I was expecting this to be about Duktape <https://github.com/svaarala/duktape>, but heh, for sure no. I'd bet $1 there's no way youtube-dl would switch, but I wonder if yt-dlp would?

Fast math optimizations can break code like this by breaking isNaN.

I was porting a C++ project to a certain platform - and that platform enabled a -ffast-math equivalent by default in Release (but not Debug) builds! This broke duktape, a JS engine said project embedded, in some nasty and subtle ways. Instead of storing a number/pointer/??? (8 bytes) + type tag (4? bytes) for each dynamically typed JS value, duktape can bit-pack values into a single 8 byte "double" value by storing object/string handles as NaN values - this isn't an uncommon trick for dynamically typed scripting stuff:

https://github.com/svaarala/duktape/blob/c3722054ea4a4e50f48...

Naturally, the -ffast-math equivalent broke isNaN checks, which caused random object/string handles to be mistakenly reinterpreted as "numbers" - but only in Release builds, for this one particular platform, in one rarely taken branch, so neither QA nor CI caught it, leading to hours of manufacturing a repro case, stepping through an absurd amount of code, and then finally looking at the default build rules and facepalming.

Cursing the platform vendor under my breath, I overrode the defaults to align with the defaults of every other config x platform combination we already had: no fast math. If you want those optimizations, use SSE-friendly NaN-avoiding intrinsics - or, if you must use the compiler flags, ensure you do so consistently across build configs and platforms, perhaps limited to a few TUs or modules if possible. This allows you to have a chance at using your Debug builds to debug the resulting "optimizations".

Sure. For example, DukTape is an implementation of Javascript designed to be embedded in other projects. Google's V8 Javascript engine (used in Chrome), can also be embedded, see Node.Js for example.

- Duktape (4.8k stars)

Don't use Youtube without going through a proxy like Invidious [1] or Newpipe

Don't use {site} Search without going through a proxy like SearxNG [2]

Don't use TwiXXer without going through a proxy like Nitter - this has gotten more difficult lately but it still works as long as you feed the daemon some registered accounts. Video does not work at the moment but that seems to be fixable.

Don't use Reddit without going through a proxy like libreddit [4]

Start noticing the pattern? Maybe it is time to start producing promotional posters:

The only thing to come between you and ADS could be a proxy / ADS. I'ts just not worth the risk

ADS / New rules for a sane net / Sane net protects you, your partner and your community

A proxy here and a filter there, ADS nowhere

The more you tighten your grip, ${site}, the more viewers will slip through your fingers

[1] https://github.com/iv-org/invidious

[2] https://github.com/searxng/searxng

[3] https://github.com/zedeus/nitter

[4] https://github.com/libreddit/libreddit

https://nitter.esmailelbob.xyz/liuzhuang1234/status/17601959...

(bit of trial and error from https://github.com/zedeus/nitter/wiki/Instances)

I assume this is why Nitter got slammed and is on the verge of breaking.

https://github.com/zedeus/nitter/issues/1154

The creator of the project left this comment an hour ago:

https://github.com/zedeus/nitter/issues/1155#issuecomment-19...

(HN removed the deep link to the specific comment from the title)

Most of the time you can just replace twitter.com with nitter.net or nitter.it but when these instances are down or blocked you can use other instances listed here: https://github.com/zedeus/nitter/wiki/Instances

But as the other commenter said Libredirect is the way to go: https://libredirect.github.io/

Use a Youtube proxy like Invidious [1], problem solved and you get to subscribe to channels without telling the Beast about your interests. Add Sponsorblock (which supports Invidious) to get rid of any in-stream advertising which remains and you'll be transported back to those hallowed times of yore when men were men, women were women and advertising was something you found in newspapers. Youtube will try to make this harder just like Xitter is trying to make it harder to use proxies like Nitter [2].

[1] https://github.com/iv-org/invidious

[2] https://github.com/zedeus/nitter

njal.la restored nitter.net, and replied with their reasons: https://github.com/zedeus/nitter/issues/1150#issuecomment-18...

tbh I can totally understand why they acted this way.