FWIW, fresh download of the amalgam and clean build with MSVC. ``` SQLite version 3.36.0 2021-06-18 18:36:39 Enter ".help" for usage hints. Connected to a transient in-memory database. Use ".open FILENAME" to reopen on a persistent database. sqlite> .parameter init sqlite> .parameter set @n -0.0 sqlite> select round(@n, 1); 0.0 sqlite> .parameter set @n -.049 sqlite> select round(@n, 1); 0.0 sqlite> .version SQLite 3.36.0 2021-06-18 18:36:39 5c9a6c06871cb9fe42814af9c039eb6da5427a6ec28f187af7ebfb62eafa66e5 msvc-1928 sqlite> ``` No repro.