executeQuery with positional parameters fails under Grails 1.3.2

After upgrading to 1.3.2, the following style of executeQuery fails:

def numBooks = Book.executeQuery(
   'select count(*) from Book where author = ? and dateCreated <= ?',
   [a, new Date()])[0]

Expected positional parameter count: 2, actual parameters: [Fri Jun 18 11:35:17 NZST 2010] [select count(*) from Book where author = ? and dateCreated <= ?]; nested exception is org.hibernate.QueryException: Expected positional parameter count: 2, actual parameters: [Fri Jun 18 11:35:17 NZST 2010] [select count(*) from Book where author = ? and dateCreated <= ?]

I vaguely recall this form of executeQuery being deprecated? But latest user guide still has it as available.

Test application with failing test attached.