[ANN] Dictionaries.jl - Improved productivity and performance of dictionaries in Julia

[tkf]

@andyferris

I’d possibly have a freezekeys or freezeindices thing that you call first in order to get what is the current behavior, and revert similar on mutable keys to making a copy.

Does it mean there would be (say) MutableIndices and FrozenIndices types? Reading your comments in #31630, I now can see that it’d work quite nicely with dict[key] = value being strict update; i.e., only dictionaries with MutableIndices support insert! while both types of dictionary support dict[key] = value.