javascript-engine

the following poc cause a assertion failure in "debug" build on ubuntu.

function opt(){
	const v2 = [-1000000000.0];
	v2.length = 4294967295;
	const v3 = v2.copyWithin();
	return v3;
}


for(let i=0;i<0x200;i++){
	opt(false);
}

We can currently convert most of Rust's basic types to JsValue, but since the i128 type was a late addition to Rust, we don't offer that conversion. You can implement it by checking how this is done for i64:
https://github.com/boa-dev/boa/blob/e2630faf82a27e958d0ca6c9b1c81554bcc07ff3/boa_engine/src/value/mod.rs#L1003-L1008

The README recommends adding ~/.jsvu to the $PATH. If you look at its contents, however:

▲  ~/ ls ~/.jsvu
.               ..              engines         status.json     v8

you'll see that I get the v8 binary (good!), but also I'm exposing status.json and engines to my $PATH

▲  ~/ engines
zsh: permission denied: engines
▲  ~/ status.json
zsh: permission deni

right now, we have a bunch of warnings in Clippy. We could fix them gradually. And set up Clippy in Ci at last.

copy_dir is quite outdated and tends to introduce a duplicate dependency on walkdir.

We can either ship a compressed version of the code, which is then uncompressed instead of copying the source directory.
Or switch to a different dependency like fs-extra.

See libquickjs-sys/build.rs.