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In the CoreException constructor, we're using the $aContextData parameter to do a count(), a foreach(), and uses values as string.
Only a null check was done.
Now we are also checking that the value is_array().
As others checks (Countable, Iterable, __toString() impl) are quite difficult depending on the PHP version we're running, we didn't add any other checks.
The call in \MatchExpression::__construct (added in 05a0d612) was passing directly an Expression object. We could embed it in an array, but the object hierarchy isn't implementing __toString so we would have another bug.
In consequence we removed this parameter.