Code:
[spoiler][list][*]item 1
[*]item 2
[*]item 3[/list][/spoiler]
[spoiler][list=1][*]item 1
[*]item 2
[*]item 3[/list][/spoiler]
- item 1
- item 2
- item 3
[*]item 1[*]item 2[*]item 3
A list in a spoiler gets eaten unless it's an ordered list, but if it's an ordered list it's changed to unordered once posted or previewed (and thus eaten during the post/preview after that).