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I'm wondering whether we can solve most of our current problems regarding fields and multifields by introducing a single new Field class that

• unifies the current Field and MultiField classes (a classic field would have a single dictionary entry with an empty string as name)
• is immutable
• can contain scalars or array-like objects to describe field content (maybe even functions?)

If we have such a class we can again demand that all operations on fields require identical domains, and we can still avoid writing huge zero-filled arrays by writing scalar zeros instead.

@reimar, @kjako, @parras please let me know what you think.