Optional
Which requested narrowings were actually pushed to the provider. Optional for backwards compatibility: a provider that predates this field returns undefined, which a caller must read as "unknown", NOT as "applied".
Messages returned in a standardized format
If populated, holds provider-specific data that is returned from the provider
Which requested narrowings were actually pushed to the provider. Optional for backwards compatibility: a provider that predates this field returns undefined, which a caller must read as "unknown", NOT as "applied".