public class StrongPool<T>
An object pool backed by strong references. Objects stored in this pool
will not be garbage collected as they refer to themselves. The client is responsible for
nulling all references to the pool instance when it is no longer needed so that
the contained objects can be garbage collected.
If a long lived, memory managed pool is required use WeakPool.
Returns the first object from this pool which is equal to the given object. If the pool
contains no such object then the object is added to the pool and returned. If the object is null,
null is returned.