Function isNotTrue

isNotTrue(value?): boolean
Returns whether the given value is nil or can be converted to false
Parameters
- Optionalvalue:
      | null
      | string
      | number
      | boolean
      | (() => boolean)
  the source value to check
Returns boolean
whether the given value is nil or can be converted to false
Example
```
isNotTrue(false);    // true
isNotTrue(undefined);    // true
isNotTrue(null);    // true
isNotTrue('no');    // true
isNotTrue('foobar');    // true
isNotTrue(() => false);    // true
```