We're using Runtime.callFunctionOn at a very high rate, and the compiled 
functions seem to be leaking -- even when using node.js' `global.gc()` or 
`HeapProfiler.collectGarbage` to manually trigger a full GC before taking a 
heapdump. Looking at a heapdump, there are many more "(compiled code)" 
objects which contain the functions passed to callFunctionOn.

I'm reviewing the code for callFunctionOn and the use of a v8::Local seems 
to suggest that the function should be freed immediately after that C++ 
scope exits, so I'm confused.
(code can be found here - 
https://source.chromium.org/chromium/chromium/src/+/master:v8/src/inspector/v8-runtime-agent-impl.cc;l=111;drc=d0e87c5b5ac8f1d884f5899f4b63967fea784d07;bpv=0;bpt=1
 
)

Am I wrong? When would the functions be garbage collected in that case?

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