A fascinating from-scratch construction of something approaching CRDTs starting from a much simpler idea, “server reconciliation”. You, yes you, can implement this!

Collaborative text editing is arguably the hardest feature to implement in a collaborative app. […] Or rather, that’s what I thought until recently. This blog post describes an alternative, straightforward approach to collaborative text editing, without Conflict-free Replicated Data Types (CRDTs) or Operational Transformation (OT).