for (entry in lruEntries.values.toTypedArray()) {
      removeEntry(entry)
    }
    mostRecentTrimFailed = false
  }

  private fun validateKey(key: String) {
    require(LEGAL_KEY_PATTERN.matches(key)) { "keys must match regex [a-z0-9_-]{1,120}: \"$key\"" }
  }

  /**
   * Returns an iterator over the cache's current entries. This iterator doesn't throw