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For questions about the implementation or design of data structures as specifically relevant to programming language design or implementation. Generic data structure questions are off-topic.

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What are the downsides of having no syntactic sugar for data collections?

For example, Python has lists, sets and dictionaries as language-level primitives that can be constructed using syntactic sugar [1,2,3], {'a': 1, 'b': 2} while Java has interfaces for each of these st …
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