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If any of the immortal, deep-frozen code objects is ever quickened, I suppose the quickening data is never freed. But when we finalize and reinitialize, the co_quickened flag should remain set, so this would be a one-time leak.
The question is whether the quickening cache points to any objects that *are* freed. If it does, that could be bad. If it doesn't, then all we lose is a fixed amount of memory (no further leaks if we finalize and initialize the runtime repeatedly).
However, if my theory holds, why would valgrind consider the memory leaked? (TBH I don't know what valgrind does, so maybe that's not the right question.)