public function delete(string $key) : bool
{
$shmKey = $this->getSHMKey($key);
if (!\apcu_exists($shmKey)) {
return true;
}
// Fetch
$fetch = \apcu_fetch($shmKey);
$length = Util::stringLength($fetch);
// Wipe:
\Sodium\memzero($fetch);
\apcu_store($shmKey, \str_repeat("", $length));
// Delete
return \apcu_delete($shmKey);
}