This bootstrap option is used primarily for servers-side
rendering using an Experiment server SDK. This bootstrap
option always prefers the config
initialVariants over data in local storage, even
if variants are fetched successfully and stored locally.
The default way to source variants within your application.
Before the assignments are fetched,
getVariant(s) will fallback to local storage
first, then initialVariants if local storage is
empty. This option effectively falls back to an assignment
fetched previously.
Determines the primary source of variants before falling back.