The Mazur–Ulam Theorem: A generalization to arbitrary topological vector spaces

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Is there a corresponding result for arbitrary topological vector spaces? For example, is a surjective isometry between linear metric spaces affine?

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There is a positive result of Rolewicz for locally bounded F-spaces:

S. Rolewicz, A generalization of the Mazur–Ulam theorem, Studia Math., 31 (1968), 501–505.

There is an extension of this result due to W. Jian:

W. Jian, On the Generalizations of the Mazur–Ulam Isometric Theorem, Journal of Mathematical Analysis and Applications, 263 (2001), 510–521.

I believe that for general metric linear spaces the problem remains open.