JS: ECMAScript 2023

• JS: Array.prototype.toSpliced
• JS: Array.prototype.with
• JS: Array.prototype.toSorted
• JS: Array.prototype.toReversed

• JS: Array.prototype.findLast
• JS: Array.prototype.findLastIndex

and in TypedArray.prototype

• added support for #! shebang comments at the beginning of file
• and allowed the use of most Symbols as keys in weak collections.