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Attempt at upgrading V8 to the latest (stable / chromium) version of 13.1.201.19.
There were a few issues in upgrading:
V8 was no longer compiling due to a combination of depot_tools being out of date, needing to use C++20, etc.
==> The v8 upgrade script is now based on the work over at https://github.com/kuoruan/libv8. This also would allow to potentially add windows in an easy way
V8GO was no longer compiling due to some changes in the V8 api and some new compatibility issues. I was able to fix all of them without any significant changes to the code basis and tests still run so I don't expect any major issues.