Doctrine DBAL Sequence comparison issues with CACHE option

gistfile1.php

<?php

$comparator = new Comparator();

// Oracle
$platform = new OraclePlatform();
$sm       = new OracleSchemaManager($conn, $platform);

$sequence = new Sequence('foo', 1, 1, null); // cache size null

$sm->createSequence($sequence); // CREATE SEQUENCE foo START WITH 1 MINVALUE 1 INCREMENT BY 1

$sequences            = $sm->listSequences();
$introspectedSequence = $sequences['foo'];

$sequence->getCacheSize(); // cache size 20 (default value on Oracle)
$comparator->diffSequence($sequence, $introspectedSequence); // returns true (changed)

$platform->getAlterSequenceSQL($introspectedSequence); // expected to return '' but returns ALTER SEQUENCE INCREMENT BY 1 CACHE 20