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The percentage calculation is currently "spread out" across various viewer functionality, which we can avoid by having the API handle that instead. Also, remove the `this.#lastProgress` special-case[1] and just register a "normal" `fullReader.onProgress` callback unconditionally. Once `headersReady` is resolved the callback can simply be removed when not needed, since the "worst" thing that could theoretically happen is that the loadingBar (in the viewer) updates sooner this way. In practice though, since `fullReader.read` cannot return data until `headersReady` is resolved, this change is not actually observable in the API. --- [1] This was added in PR 8617, close to a decade ago, but it's not obvious to me that it was ever necessary to implement it that way.