How does JuliaCall (PythonCall) protect Julia objects in Python code from Julia's GC?

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Here it is: PythonCall.jl/src/JlWrap/C.jl at 71666ca0a30eafee2456a191fa2490cdd0b0ed22 · JuliaPy/PythonCall.jl · GitHub

Pretty simple really, we keep a global vector containing all of the wrapped Julia values and the Python wrapper just holds the index into this vector.

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