Sorry for the very vague noob question, I really want to ask this:
When do we use async or sync code in the context of Elixir? AFAIK genserver call is synchronous which is blocking code. Do you have a real example or when do you decide which one to use? I’ve read these article When should I use asynchronous code in JavaScript? – Nico Zerpa, Your JavaScript Friend, but I haven’t found a good example when it is better to use sync over async and vice versa. Any help/enlightenment is greatly appreciated 
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