manifest

When building a pie-item, it is important to know what dependencies, app-types etc were involved in building the item. This will allow someone who is about to run the command to check whether it is necessary or not. If they have a different pie-item, but that item has the same dependencies etc then one can safely use the pre-built code.

The question is:

1. what data is used to uniquely identify the build
2. what form should it take

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