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output_buffer::grow() compared the output size with m_out.capacity(), which the StringType requirements do not include, so dump() did not compile with the tests' alt_string. Keep what was last reserved in the buffer itself and use it as a lower bound of the capacity instead. Add json_view tests with alt_string (read-only and editable documents, dump with several growth steps, save/load), and document reserve(n) and resize(n) as the StringType requirements of basic_json_view::dump. Signed-off-by: Niels Lohmann <mail@nlohmann.me>