[erlang-questions] Best Practice in Map keys: Atoms or Binaries (or Strings)?

[José Valim]

>
> Also, for literal keys the hashing is done at *load time* so it will only
> hash again when it that hash exhausted, typically this will happen if Maps
> are larger then 50000 pairs.
>

Neat. Does this happen only on maps creation or also when updating maps
with := or =>? What about matching on maps?
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