Fix method call

Can you please tag a new minor 2.1.* release after merging this PR? With this, the jackalope builds should be fixed (at least the non-lowest jobs)
nope, $passed is a boolean. it will always equal a non-empty string but this is not what we want to do.

it seems that a query is not exactly parsed back to what it was before when being converted to a string. but this test is rather not explaining much what is happening. and maybe doing a too strict assumption.

i am not sure if its a test problem or a bug in some versions of the query parser. it **did** have problems with operator precedence.