# nand

Apply NAND operation with a boolean to the current state of a RefBoolean.

## Signatures

```ts
export declare const nand: {
    (that: boolean): <E, R>(ref: RefBoolean<E, R>) => RefSubject.Computed<boolean, E, R>;
    <E, R>(ref: RefBoolean<E, R>, that: boolean): RefSubject.Computed<boolean, E, R>;
};
```

## Why

Apply NAND operation with a boolean to the current state of a RefBoolean. The operation remains
attached to the RefSubject's versioned state boundary.

## Ownership and lifetime

The nand view retains no independent state. An Effect read samples the source once; Fx
observation follows later pushes and its observing Scope owns subscription cleanup.