ArrayList.remove not consistent with subscript notation

Running the following code:

def list = [1, 2, 3, 4, 5]
println list[-1] //Displays 5
list.remove(-1) //Throws exception. Should be consistent with above
println list //Never gets here due to exception but the expected output is [1, 2, 3, 4]

produces unexpected results. I would expect list.remove to be able to accept negative indices, just as the [] notation allows me to.