The parents of a two-year-old girl with a life-limiting illness have told of their "exhaustion" after being refused a request for respite help.
For implementers, the locking model adds a fair amount of non-trivial internal bookkeeping. Every operation must check lock state, readers must be tracked, and the interplay between locks, cancellation, and error states creates a matrix of edge cases that must all be handled correctly.
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To solve the first problem, I've decided to divide the page into grid of 250x250 tiles. This seemed like the simplest solution overall, without turning the page into unmanagable mess. It would be extremely cool to let people have a sort of free canvas, but unfortunately I never managed to actually think of any system that would allow doing this safely and anyhow performantly.
Http handlers (exposed APIs, but also Server-side rendering),