OptionalonCalled once if the worker pool cannot be spawned and decoding degrades to the main
thread. Supply your own sink (e.g. a layer's onError) — Tiles3DPointCloudLayer
constructs this decoder with no options, so degradation is silent unless you pass it.
OptionalpoolWorker pool size (default: ~navigator.hardwareConcurrency − 1, capped at 4).
Optionalwasmwasm load + init overrides forwarded to each worker; see WasmHostInit.
Construction options for WorkerBvcGltfPointCloudDecoder.