France: EU + Europe missing ? about country-coder HOT 3 CLOSED

Weird, yeah I don't really understand it.
I do know that "Metropolitan France" with the ISO code FX, and is a separate feature that is within France and within Europe, EU, etc..
https://ideditor.codes/?code=Q212429
"groups": ["FR", "155", "150", "EU", "UN", "001"],

from country-coder.

I did some more testing today and I still don't know what's going on

> import("@ideditor/country-coder").then(module => { cc = module });
Promise { <pending> }
> cc.isInEuropeanUnion('fx')
true
> cc.isInEuropeanUnion('fr')
false
> cc.isInEuropeanUnion('es')
true

I don't see any obvious difference in the data in how Spain and France are different. Both are made up of "parent" features with null geometry and "child" features with groups properties.

from country-coder.

Update: I noticed a few interesting facts in the borders.json data file:

Neither spain nor france are directly listed as members of the EU.
all of Spain's territories are listed as having EU group membership, even though Spain itself does not.
None of France's territories are listed as having EU group membership. France itself, like spain, is also not listed as a direct EU member.

So why the difference?

If I modify all of France's territories to also be members of the EU, then the test starts to pass. Somehow, group membership is being synthesized from the 'ground up', considering constituent territories first.

from country-coder.