CompareCacheHashEntry *entry = NS_STATIC_CAST(CompareCacheHashEntry*, hdr); return entry->key;
CompareCacheHashEntryPtr *entryPtr = NS_STATIC_CAST(CompareCacheHashEntryPtr*, hdr); return entryPtr->entry->key;
CompareCacheGetKey(PLDHashTable *table, PLDHashEntryHdr *hdr){  CompareCacheHashEntry *entry = NS_STATIC_CAST(CompareCacheHashEntry*, hdr);  return entry->key;}