Assert unique values in array

[Tomasz Darmetko]

One more proposition - allow to assert that all values in an array are unique e.g.

Assert::uniqueValues($array)
Assert::allUnique($array)
Assert::noDuplicates($array)

I would follow semantics of array_unique() so probably the assertion would look like:
count($array) === count(array_unique($array))

[Jules Pietri]

👍 on Assert::uniqueValues(iterable $iterable)

[David Garcia]

https://secure.php.net/manual/en/language.types.iterable.php

Iterable is a pseudo-type introduced in PHP 7.1

Given this repo needs to keep compatibility with previous PHP versions, then we can't use iterable but array