This test checks that custom data attributes are not lost due GC while still referenced. On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE". PASS successfullyParsed is true TEST COMPLETE PASS 0.5000000000000001 is within 1e-9 of 0.5 PASS 0 is 0 PASS 0 is 0 PASS 0.5000000000000001 is within 1e-9 of 0.5 PASS 0 is 0 PASS 0 is 0 0.5000000000000001,0,0,0.5000000000000001,0,0