Well I don’t have code like that – that’s just sample code to demonstrate the underlying behaviour: that Elixir allows you to manipulate a struct into something that looks nothing like the struct, but it still treats it as a struct.
(For the curious, the issue was that somewhere in a codebase someone had, with good intentions, deleted from a struct all keys whose value was nil. This caused issues elsewhere in the codebase – specifically when relying on the default @derive implementation of Jason.Encoder – where code assumed that if something was a struct then all the keys should be there.)
I know you shouldn’t write code like that; my question was whether Elixir should - or indeed could - be doing something to stop you.
