Reduce output of Constraint failure descriptions, when asserting against trivial data types

[glady]

When I write a test, that expects a boolean as return value, but - for some reason - does not get a boolean from the tested code, but a big array or an object, the whole object is dumped into the failure description. This potentially is a big waste of memory and makes reading the output quite hard.

Examples:

• src/Framework/Constraint/Boolean/IsFalse.php
• src/Framework/Constraint/Boolean/IsTrue.php

My feature request would be:

• I would like just to get the message that its an object or an array, which was compared with false or true in this example instead of a dumped object / array
• alternatively, if rejected, I want to have an option not to dump objects recursively at all (as its currently implemented in \PHPUnit\Framework\Constraint\Constraint::failureDescription) or even to choose an exporter logic on my own.