It doesn't need to support eager re-computation, just lazily finding item at position N after splice has occurred (in O(log n) if possible).
@seancribbs It's for something more general than ArrayController, but could be used in ArrayController, yeah.
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@wycats Cool. Yeah, something where you could reuse the old version, applying changes on top would be good. Maybe@swannodette has ideas? -
@seancribbs Persistent data structures don't have to grapple with mutations to the source, though, right?@swannodette
End of conversation
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