String.to_existing_atom/1 is a double-edged sword TMIB-23: This November, a few scalability problems were fixed

Leandro Bighetti - How to teach Elixir to non-functional developers - Code BEAM Lite Berlin 18

Shameless plug: Check out @elixirstatus' other community project:

Credo, a new static code analysis tool that acts as a code linter, but also focusses on teaching coding practices and code consistency.