Implement `Not` rule

[vjik]

new Not(
    new Number(min: 7, max: 12)
)

[BoShurik]

What an expected result for value e.g. not-a-number in that case?

[vjik]

What an expected result for value e.g. not-a-number in that case?

Simple logic: if internal rule is valid, then Not return error, otherwise return success.

[arogachev]

Looks cool at first, but it's ambiguous. Maybe the provided example is not the best one, but I agree with @BoShurik - can't think where it can be used in practice (not a number). Combining it with Callback is even more confusing (an exception can be thrown, but depending on specific rules is not good).

Also we have $not properties for inverting logic in certain rules, like in Regex. Maybe use interface / trait pair instead like with "skip on empty", "skip on error", "when" only where it's supported / needed?

Also suggest to delay it to after initial release.

[BoShurik]

@vjik your example meant to accept numbers not in range 7 and 12 but it also accepts not valid numbers. And it may be not obvious to add additional Number rule

[vjik]

It's synthetic example for show syntax only.

[BoShurik]

It shows that you can't invert all rules. E.g. new Not(new TrueValue()) will accept incorrect input

[samdark]

Let's wait for real use-cases for rule inversion first.