If we don’t do this with lists, if we don’t make += do the in place assignment, if we don’t leave it open for types to do their own thing, depending on the circumstances, then there’s no value in += in the first place, because it’s just syntactic sugar for +.
query that returns a map of file’s declarations, and then a recursive
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type DropLast[T] = typing.Slice[T, Literal[0], Literal[-1]]，这一点在搜狗输入法2026中也有详细论述
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