Reads a path's value and mints a blob: URL for it: the one step load() has to await. A
finished-URL value comes back as it is, with no type; typed bytes keep the MIME type they
were given. The result is cached per path until forgetAssetUrl or setAssetMap.
Reads a path's value and mints a
blob:URL for it: the one stepload()has to await. A finished-URL value comes back as it is, with no type; typed bytes keep the MIME type they were given. The result is cached per path untilforgetAssetUrlorsetAssetMap.