extra() with LIKE and params breaks

What I am seeing is this. I think it is somehow related to the mass use of the percentage char. I couldn't get it to work on both sqlite and PostgreSQL 7.4

>>> Speaker.objects.extra(where=['first_name LIKE "%%bla%%"'])
[]
>>> Speaker.objects.extra(where=['first_name = %s'], params=['bla'])
[]
>>> Speaker.objects.extra(where=['first_name LIKE "%%%s%%"'], params=['bla'])
Traceback (most recent call last):
  File "<console>", line 1, in ?
  File "/usr/lib/python2.4/site-packages/django/db/models/query.py", line 108, in __repr__
    return repr(self._get_data())
  File "/usr/lib/python2.4/site-packages/django/db/models/query.py", line 483, in _get_data
    self._result_cache = list(self.iterator())
  File "/usr/lib/python2.4/site-packages/django/db/models/query.py", line 189, in iterator
    cursor.execute("SELECT " + (self._distinct and "DISTINCT " or "") + ",".join(select) + sql, params)
  File "/usr/lib/python2.4/site-packages/django/db/backends/util.py", line 18, in execute
    return self.cursor.execute(sql, params)
  File "/usr/lib/python2.4/site-packages/django/db/backends/sqlite3/base.py", line 133, in execute
    return Database.Cursor.execute(self, query, params)
ProgrammingError: Incorrect number of bindings supplied. The current statement uses 0, and there are 1 supplied.

As a model to try with this should suffice:

class Speaker(models.Model):
    first_name = models.CharField(max_length=25)

I forgot: This output is generated using sqlite3 and newforms-admin revision 7020.

[anonymous]

Has this issue been addressed?
Is there a work around for it?

[alfredo1]

I think you should change the percentage sings to be in the actual params

So it would be like:

Speaker.objects.extra(where=['first_name LIKE %s'], params=['%bla%'])

[Klaas van Schelven]

I'm marking this as invalid. alfredo1's remark is correct. I've just doublechecked:

>>> Two.objects.all().extra(where=['a_field LIKE %s'], params=['%bla%'])
[]