```
[] ~/projects/jruby $ cat array.rb 
a = [
  1,
  2,
  3,
]

[] ~/projects/jruby $ jruby -rcoverage -e 'p Coverage.line_stub("array.rb")'
[0, nil, nil, nil, nil]

[] ~/projects/jruby $ rvm ruby-2.6.5 do ruby -rcoverage -e 'p Coverage.line_stub("array.rb")'
[0, nil, nil, nil, nil]
```