formatWithOptions is missing

https://nodejs.org/api/util.html#utilformatwithoptionsinspectoptions-format-args

inspect has options, just need to forward them

The linked Node.js util documentation defines formatWithOptions; start by locating the existing inspect implementation and its exports. Confirm the missing entry point forwards inspect options and matches the documented behavior, then compare the result with the linked API reference.

索引モデルが issue の本文から書いたものです。