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error:
       … while calling the 'floor' builtin
         at /pwd/in.nix:5:25:
            4| {
            5|   floor-bad-weird-int = builtins.floor (big - 1);
             |                         ^
            6|   floor-okay-weird-int = builtins.floor big;

       error: builtins.floor was corrupting your integer (was 9223090561878065151, became 9223090561878065152) in previous versions due to a historical Nix bug (https://github.com/NixOS/nix/issues/12899).
       This may be changed in the future to pass through integers as-is, which will change the semantics of this code.
       To suppress this error, use --extra-deprecated-features floor-ceil-corrupt-integers