Format extra level of extraneous / missing complex items when depth limit is reached

https://github.com/avajs/ava/issues/1850

Complex items are often not understandable without seeing their properties or (if they’re lists or iterables) nested items. If the depth limit is reached we should still format an extra level, so rather than

  [
+   Object { … },
    Object { … },
  ]

we could print:

  [
+   {
+     id: 'first',
+   },
    {
      id: 'second',
    },
  ]

We’ll have to consider whether this is a violation of the “max depth” concept. I have a feeling we already do this elsewhere though.

Printing all items at an extra level may be unnecessary.

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• #62 Reset depth when formatting differences

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[bunysae]

Spoken in the case of ava, the best compromise would a parameter passed to ava-cli. If this parameter is omitted, the default depth-level can be used. For example:

• npx ava --depth 1 for max. one depth-level,
• npx ava --depth 2 for max. two depth-levels, …
• npx ava --depth f for full-depth-formatting
• npx ava with the defaults Then it is up to the user finding the correct depth-level and it wouldn’t violate the existing behavior.

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