Inheriting from Array (and other core types) is problematic:
- It exposes a very wide interface with many methods that are not
really relevant to the subclass.
- It can cause some weird side effects, as many Array operations are
in C and have hardcoded return values; for example, combining two
array subclasses returns a new Array instead of the subclass.
Avoid these problems using delegation and the Enumerable module where
applicable.
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