BC: Extract EnumType from comment hint is broken !

Bug Report

Q	A
Version	4.0.0

Summary

I was used to create EnumType using a EnumSubscriber::postGenerateSchema; This subscriber was using CommentHint. This has been removed from dbal in the commit 4134b86cb986f6fc68fe9ba7c8a7416debfa22bd.

<?php

namespace App\DatabaseSubscriber;

use App\Database\Type\EnumType;
use Doctrine\DBAL\Schema\Column;
use Doctrine\ORM\Tools\Event\GenerateSchemaEventArgs;

class EnumSubscriber
{
    public function postGenerateSchema(GenerateSchemaEventArgs $eventArgs)
    {
        $columns = [];

        foreach ($eventArgs->getSchema()->getTables() as $table) {
            foreach ($table->getColumns() as $column) {
                if ($column->getType() instanceof EnumType) {
                    $columns[] = $column;
                }
            }
        }

        /** @var Column $column */
        foreach ($columns as $column) {

            $enum = $column->getType();
            $column->setComment(trim(sprintf('%s (%s)', $column->getComment(), implode(',', $enum::getPermittedValues()))));
        }
    }
}

Current behaviour

Current behavior, makes db schema update infinitely refreshing.

How to reproduce

Just create a EnumType following; and use postGenerateSchema subscriber.

Expected behaviour

I would expect to restore in AbstractSchemaManager.php:

    public function removeDoctrineTypeFromComment($comment, $type)
    public function extractDoctrineTypeFromComment($comment, $currentType)

Then restore on every platform,

        $type = $this->platform->getDoctrineTypeMapping($dbType);
         // In cases where not connected to a database DESCRIBE $table does not return 'Comment'
        if (isset($tableColumn['comment'])) {
            $type                   = $this->extractDoctrineTypeFromComment($tableColumn['comment'], $type);
            $tableColumn['comment'] = $this->removeDoctrineTypeFromComment($tableColumn['comment'], $type);
        }

Unless this was suppressed on purpose, it was very useful feature to incorporate EnumType. If an alternative is possible, please advice.

doctrine / dbal