Optional ReadonlywasmWhere to load the decoder .wasm from. Omit in the browser to let the bundler
resolve the package-sibling wasm; in Node/Bun (or for a cross-origin CDN bundle)
pass wasmBytes/wasmUrl. See WasmHostInit; the wasmBytes/wasmUrl
precedence is documented once on @bitruvius/geo-core's BitruviusConfig.
Construction options for SpzDecoder.