Mistyping hash keys is something that happens when you
use hashes. It's not something that only happens when you
use hashes of hashes, nor do hashes of hashes make it worse.
And you can prevent this from happening by making all your
keys constants, and prepending a + in front of
each key that otherwise might be autoquoted.
Disallowing hashes of hashes sounds as useful to me as disallowing
arithmetic which involves divisions, as some people don't master
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