Disable assertions by default

Ignore-this: 24c7e86a680aab9066b4711c70c97da2

darcs-hash:20121011134020-58252-d102df12efda0d1b7caef5446908b278919a8dfc
Simplified statements

Ignore-this: 8a42dcbd73bc0e1544081960d5ab8b03

darcs-hash:20121012094910-b22ec-f9784c183357fbaef269d74a51d4938f406025f6