Typespecs to the rescue. Declare your types as opaque and users should know they shouldn’t depend on the structure. If they use dialyzer they will even get errors when matching on the structure or using the dot field access.
ericmj
Elixir Core Team
DianaOlympos
BTW this is exactly how Liskov and Zilles handle types in their “Programming with Abstract Data Types” paper. So seems it has some reasons 
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Qqwy
TypeCheck Core Team
Yes, exactly! I feel like more library designers should be aware of this option, and should use this, in my opinion.
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