PendingInsertHandle
Include fastly/kv_store.h to use this struct.
Extends fastly::kv_store::detail::KVPendingHandle<PendingInsertHandle>.
A handle to a pending asynchronous insert returned by InsertBuilder::execute_async().
A handle can be evaluated using KVStore::pending_insert_wait(). It can also be discarded if the request was sent for effects it might have, and the response is unimportant.