You're seeing just the function safe_atomize_keys, go back to PassiveSupport.Map module for more information.
Link to this function


Returns a map with any string keys that safely coerced to existing atoms

I'm not giving y'all the ridiculously dangerous footgun of wanton atom space pollution. I'm not some crazy, foot-shooting cowboy, like Jason.


iex> [:oh, :yay] # existing keys
iex> safe_atomize_keys(%{"oh" => "ooh", 'yay' => 'yaaay'})
%{oh: "ooh", yay: 'yaaay'}
iex> safe_atomize_keys(%{"oh" => "ooh", "noo" => "noooo"})
%{oh: "ooh"}