called ?{} with no a
array = { }
called ?{} with a: 999
array = { 999, }
called ?{} with a: 123 456
array = { 123, 456, }
called ?{} with a: 100 200 300
array = { 100, 200, 300, }
called ?{} with a: 10 2 3 4
array = { 10, 2, 3, 4, }
