SDKInitOptions.subsetterUrl

A self-hosted copy of pdf-subset.bin (~0.6 MB), the font-subsetting binary — self-hosting licenses only, likewise refused with FEATURE_NOT_LICENSED without self-hosting. It is downloaded on first use when fonts.subset is on, so an exported document embeds only the glyphs it uses. Fetch it once from the store under the subsetter folder by Kernstra.assetDigests.subset. It is optional: if it cannot be loaded, the SDK warns once in the console and embeds full fonts, as it does with subsetting off.