You really should never mix them, String keys are basically only there for accepting untrusted input, and should get sanitized. Any internal map should only hav

You really should never mix them, String keys are basically only there for accepting untrusted input, and should get sanitized. Any internal map should only have atom keys. String keyed maps exist so that you can accept inputs from untrusted sources without worrying about a malicious or malformed input from overflowing the atom table and crashing your VM.