fn appendSlice(list: *std.array_list.Managed(u8), buf: []const u8, max_value_len: usize) !void
fn appendSlice(list: *std.array_list.Managed(u8), buf: []const u8, max_value_len: usize) !void { const new_len = std.math.add(usize, list.items.len, buf.len) catch return error.ValueTooLong; if (new_len > max_value_len) return error.ValueTooLong; try list.appendSlice(buf); }