> Shared structure is overrated. The cases where you need a tree-like mutable structure are vanishingly small in modern times. Mostly it boils down to "just us

> Shared structure is overrated. The cases where you need a tree-like mutable structure are vanishingly small in modern times. Mostly it boils down to "just use hash tables." So confused by this. Shared, tree-like, and mutable seem pretty orthogonal to me. Sure, I'll forgo mutable structure. And since I don't mutate, I can safely share structure. But I don't want O(n) update operations, so I'd better make my hash tables use a tree-shaped data structure: https://en.wikipedia.org/wiki/Hash_array_mapped_trie https://en.wikipedia.org/wiki/Hash_array_mapped_trie