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today i learned java stack overflows if you try to insert a map into itself as a key, but not as a value
@aescling assuming HashMap, that shouldn't be the difference: its hash code includes both keys and values. Also put calculates the hash of the key well before making any changes to the HashMap.
Tho it seems like whenever a resize triggers it will stack overflow for both the key and value cases for that reason.
also it would be impossible to reliably actually get a HashMap out of itself (since the hash it'll be stored under won't be true once it's stored).
oh my god is it because Map.hashCode calls hashCode on every key