Following are some of the updates introduced in this version:
Support for embedded builtins
Embedded builtins are now supported and enabled by default on the ia32 architecture. The main aim of embedded builtins is to eliminate the per-Isolate builtin overhead by making builtins truly isolate-independent.
Async stack traces
A new feature called zero-cost async stack traces is introduced, which improves the error.stack property with asynchronous call frames. This feature aims to solve the problem developers were facing that the error.stack property in V8 only provides a truncated stack trace up to the most recent await. It is currently available behind the –async-stack-traces command-line flag.
Public class fields
This version supports public class fields and support for private class fields is planned for a future V8 release.
The well-formed JSON.stringify proposal is implemented in V8 7.2. Previously, JSON.stringify used to return ill-formed Unicode strings if the input had any lone surrogates. To solve this, well-formed JSON.stringify outputs escape sequences for lone surrogates, making its output valid Unicode and representable in UTF-8.
You can read the full list of updates on V8’s official website.