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It actually makes reasoning easy. What gets copied: everything. What gets shared: nothing.


Except that isn't true in Erlang (or other BEAM languages). Binaries larger than some threshold are managed on a shared-heap. I think a couple other things have been promoted to being managed that way too fairly recently.


You might be thinking of the optimization for constant pool references: https://medium.com/@jlouis666/an-erlang-otp-20-0-optimizatio...


Yes, that. Thank you.


That's not true in a number of cases, and thankfully what you said isn't right or the BEAM would truly be a disaster.




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