Immutable structures are beautiful when I’ve got an editor for geographic data and want a high performance undo/redo stack with basically no effort. It’s also c

Immutable structures are beautiful when I’ve got an editor for geographic data and want a high performance undo/redo stack with basically no effort. It’s also considerably cheaper to identify when groups of polygons have changed by object identity rather than deep equality. Did this property change? Did properties in general change? Did this polygon change? Did this collection of polygons change? All using === equality checks without any manual plumbing. About ten years into doing it this way and I’ve got one regret: starting with ImmutableJS instead of Immer.