Object instances Cloning instead of recreating
So far, the cache index for templates was assigned when creating the templates and not when inserting into the cache. As a result, the Engine space in the faster array cache has reserved for ultimately non-instantiated templates.
Await standard active
V8 9.1 stop the top-level awaitable activated by default. This means that applications can use the command also outside an Async functions, but only on the top module level. The use in scripts or within functions without Async is not permitted. Thus, the necessity for the command line parameter –Harmony-top-level await. The syntax for providing private brands is now activated by default without requiring –harmony-private fire checks. This function should expand the IN Operator in the way that it also works with the # names of private fields.