Incorrect behavior of ExplicitBoolCompareRector - double variable assignment in condition

[etshy]

Bug Report

Subject	Details
Rector version	last dev-main
Installed as	composer dependency

Minimal PHP Code Causing Issue

See https://getrector.com/demo/df4a4011-49f2-4fd2-96e7-a1627ebb4eaa

<?php

declare(strict_types=1);

final class DemoFile
{
    public function run(): int|string
    {
        if ($base64 = base64_encode('')) {
            return 5;
        }

        return '10';
    }
}

Responsible rules

• ExplicitBoolCompareRector

Expected Behavior

Not doubling the variable assignment.
Or make the variable assignment before the condition and then using the variable.

[samsonasik]

we are aware of it, just not a priority right now #8663 (comment)

[samsonasik]

Re-open, assign inside condition seems needs special check, also the ExplicitBoolCompareRector seems not using ExactCompareFactory