Feature: Not
@const @not
Scenario: not
Given a YAML schema:
```
not:
type: number
multipleOf: 2
```
Then it should accept:
```
1
```
And it should accept:
```
-1
```
And it should accept:
```
3
```
But it should NOT accept:
```
2
```
And it should NOT accept:
```
-2
```