user revision seems not to play well with caching, data changes are not seen

UGH, after ages of bughunting i could distill a test case that really makes me nervous:
(users are setup on this site so that new revisions are created by default, if that matters)
hack this into devel/php:

$uid=36; // change as appropriate
$account = user_load($uid);
print "Name before: $account->name\n";

$newname = 'Not '. $account->name;

print "Setting name to: $newname\n";
user_save($account, array('name' => $newname));

$dbresult = db_query('select name from {users} where uid=:uid', array(':uid' => $uid));
foreach($dbresult as $account) {
print "Name in DB: $account->name\n";
}

$account = user_load($uid);
print "Name from user_load: $account->name\n";

givers:

Name before: oldname
Setting name to: Not oldname
Name in DB: Not oldname
Name from user_load: oldname

it seems that cache is not invalidated correctly after save.

moreover:
if you do (note added " 'revision' => 1" in line "user_save"):

$uid=36; // change as appropriate
$account = user_load($uid);
print "Name before: $account->name\n";

$newname = 'Not '. $account->name;

print "Setting name to: $newname\n";
user_save($account, array('name' => $newname, 'revision' => 1));

$dbresult = db_query('select name from {users} where uid=:uid', array(':uid' => $uid));
foreach($dbresult as $account) {
print "Name in DB: $account->name\n";
}

$account = user_load($uid);
print "Name from user_load: $account->name\n";

givers:

Name before: oldname
Setting name to: Not oldname
Name in DB: Not oldname
Name from user_load: Not oldname

(ok, changes correctly saved)

but notices:

Notice: Undefined index: vid in user_revision_user_presave() (Zeile 318 von /home/xl/workspace/sanago/sites/all/modules/user_revision/user_revision.module).
Notice: Undefined index: picture in _user_save_revision() (Zeile 341 von /home/xl/workspace/sanago/sites/all/modules/user_revision/user_revision.module).