If you use the following checklist:

{checklist:Content|label=featured|width=30%}
    {checklist-metadata:Space|width=10%}
    {checklist-excerpt:Excerpt|width=30%}
    {checklist-wikiinput:why-featured|title=Why Featured?|cols=50|rows=3|width=30%|store=checklist}
    {checklist-label:Featured?|label=featured|width=20px}
{checklist}

And you have a page that uses the 'featured' label AND has the same name in multiple spaces, you can have multiple rows that try to access the same peice of metadata. For example:

If you have three pages with the name "Home" in three spaces, A: B: and C:. If you edit the row for A:Home, you will immediately update the metadata for "why-featured.Home". This metadata is the same for A:Home, B:Home and C:Home.

Setting the comment for A: and B: results in this log:

Changed why-featured.Home from shows 'panels' layout to main help space
Changed why-featured.Home to shows 'panels' layout

Upon refresh, all three rows show the same value, "main help space"

Perculiarites

• if you change A and refresh, you see A B and C all changed. If you change A and don't refresh, B and C remain unchanged in the display.
• if you don't even have access to C (no edit pencil), you can still change the value since they use the same metadata key
• both of these are side effects that I think would be totally avoided if you had a unique key

Recommend

• use a unique key that incorporates the space. I.e. why-featured.A:Home

Note: Something to think about while you are making this change

• I think this will break the existing store=checklist metadata and perhaps the current 'checklist logs', so it should perhaps be considered a 'major' version update (1.3? 2.0?)
• What happens if I name one column A and another column A.B, and there is a page named B.C and a page named C?

Thanks! All all together awesome plugin.