Description:
------------
On a very large float-string string offset a memory exhaustion error kills the process although this could be prevented because a TypeError has already been thrown.

This bug is limited to PHP 8, as prior to this version invalid string offsets only emitted an E_WARNING.

Test script:
---------------
<?php

$float = 10e120;
$string_float = (string) $float;

$string = 'Here is some text for good measure';

try {
    echo 'Float casted to string compile', \PHP_EOL;
    $string[(string) 10e120] = 'E';
    var_dump($string);
} catch (\TypeError $e) {
    echo 'TypeError', \PHP_EOL;
}

?>

Expected result:
----------------
Float casted to string compile
TypeError

Actual result:
--------------
Float casted to string compile

Warning: Uncaught TypeError: Cannot access offset of type string on string in /in/HlIY7:10
Stack trace:
#0 {main}
  thrown in /in/HlIY7 on line 10

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 9223372036854775840 bytes) in /in/HlIY7 on line 10

Process exited with code 255.