Function isNotBoolean

isNotBoolean<T>(u: T): u is RelaxedExclude<T, boolean>
Type guard that checks if a value is not a boolean.

Type Narrowing Behavior:
- Excludes boolean from the input type when true
- Preserves all other types in the union
Type Parameters
- T
  The type of the input value
Parameters
- u: T
  The value to check
Returns u is RelaxedExclude<T, boolean>
true if u is not a boolean, false otherwise. When true, TypeScript excludes boolean from the type.
Example
```
const flags: unknown[] = [true, 'no', false];

const nonBooleans = flags.filter(isNotBoolean);

assert.deepStrictEqual(nonBooleans, ['no']);
```
- Defined in src/guard/is-type.mts:99