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Comment by vscode-rest | Hacker News Reader

Tuple entries must be hashable, which (as far as standard library is concerned) means immutable.

  >>> hash([1, 2])
  TypeError: unhashable type: 'list'

  >>> t = ([1, 2], [3, 4])
  >>> print(t)
  ([1, 2], [3, 4])

Ah. Of course… that’s how the workaround to use tuples as frozen dicts can work in the first place. Slow morning for me!