Examples
(floor 2.5) --> 2 (floor -2.5) --> -3
(ceiling 2.5) --> 3 (ceiling -2.5) --> -2
(truncate 2.5) --> 2 (truncate -2.5) --> -2
(round 2.49) --> 2 (round 2.51) --> 3
(round 2.5) --> 2 (round -2.5) --> -2
(round 1.5) --> 2 (round -1.5) --> -2
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