# `Orchid.Repo.ContentAddressable`
[🔗](https://github.com/SynapticStrings/Orchid/blob/main/lib/orchid/repo.ex#L68)

Optional behaviour for adapters that can answer cheap existence
queries without deserialising the stored value.

Used by cache-hit verification in OrchidStratum's BypassHook.

# `exists?`
[🔗](https://github.com/SynapticStrings/Orchid/blob/main/lib/orchid/repo.ex#L75)

```elixir
@callback exists?(store :: Orchid.Repo.store_ref(), Orchid.Repo.key()) :: boolean()
```

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*Consult [api-reference.md](api-reference.md) for complete listing*