Checks that describing cyclic internal#entry wrappers terminates.
Original entries:
0: {1 => 2}
1: {3 => 4}
2: {5 => 6}
Nested non-cyclic entries:
0: {1 => {3 => 4}}
1: {3 => 4}
2: {5 => 6}
Cyclic entries:
0: {1 => {Object => Object}}
1: {Object => {1 => Object}}
2: {5 => Object}
