In learning about custom Drupal 8 module development, I found plenty of very simple field module examples, but none that covered how to store more than one value in a field and still have it work properly, so it's time to fix that.

To save you typing or copy and pasting things around all the code in this post is available on Github at https://github.com/ixis/dicefield

Concepts

There are three main elements to define when creating a field type:

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