Mark S. Miller (2015-06-17T21:08:44.000Z)
d at domenic.me (2015-07-07T01:43:31.189Z)
I am curious about what these are? But regardless, I would expect there to be examples where it would be useful if it weren't fatal. Regarding the issues in this thread, it actually would be safe to allow unregistered Symbols as keys. But unless these examples are tremendously compelling, please let's not.