Description:
------------
This is well-known from long-past bugs e.g. https://bugs.php.net/bug.php?id=41195, but it really should be reconsidered at some point for future language versions.

It's pretty nuts that undefined offset access is more strict for arrays than it is for booleans (and other objects). Booleans should probably be able to complain about being accessed as arrays.

Test script:
---------------
<?php 
error_reporting(E_ALL);
$boolean = true;
$array = [];
$boolean['hello']; // No error
$array['hello'];  // E_NOTICE

Expected result:
----------------
$boolean['hello'] should throw some error.