[Kirill Balunov]
It may be worth taking a look at + and +=. However, the semantic
difference is due to the dunder add and dunder iadd methods-
necessary for supporting both mutable and immutable sequences. See my
earlier mail for discussion on this topic.
By the way,
> the absence of literals for `set` and `frozenset` types,
>
The literal for the set is {1, 2, 3, 4}.
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