[heycam/webidl] A "duplicate Id" DOM Exception? (#428)

In the Payment Request spec, I have a situation where I need to check if an id exists and throw a DOMException of some sort. 

I noticed that IDB is using "ConstraintError": 

> A mutation operation in a transaction failed because a constraint was not satisfied.

But the above description is overly specific for my case. I wonder if we should reword the above to be less databasey?

Same applies to "VersionError":  

> An attempt was made to open a database using a lower version than the existing version. 

should probably drop the word database, because it could, in theory apply to a any kind of versioned data store.

Anyway, I'm happy to use "ConstraintError" but I'm wonder if maybe we could have a "NotUniqueError" or "DuplicateId" error? It feels like a common thing. 
 

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