Type Alias Head 

pub type Head<T: Config> = StorageValue<_GeneratedPrefixForStorageHead<T>, UnstakeRequest<T>, OptionQuery>;

The current “head of the queue” being unstaked.

The head in itself can be a batch of up to Config::BatchSize stakers.

Storage type is [StorageValue] with value type UnstakeRequest < T >.

Aliased Type

pub struct Head<T: Config>(/* private fields */);