newdefaults

Newdefaults is a term used in software development to describe the practice of introducing updated default configuration values in a new release. It denotes a deliberate change to the behavior of a program or library without requiring users to modify their existing configurations, while providing a defined path to adopt the new behavior.

The concept applies across software layers, including applications, libraries, and framework components. Implementations typically involve layered defaults (system-wide, user-specific, and runtime) and may be exposed through configuration files, environment variables, or code-level defaults. New defaults are commonly delivered alongside feature flags, migration utilities, or dedicated migration guides to assist users in transitioning.

Rationale for adopting new defaults includes improved security, better usability, enhanced performance, and greater consistency across installations. They can help standardize practices, reduce misconfigurations, and simplify maintenance. However, shifting defaults can alter behavior in ways that affect existing workflows, so careful planning is advised.

Migration and compatibility are central to the approach. A deprecation schedule may accompany the rollout, with clear timelines for phasing out old defaults. Tools or scripts for automatic migration, extensive test suites, and comprehensive release notes support compatibility. Documentation typically explains what changes are introduced, how to opt out, and how to adapt configurations to the new defaults.

Adoption considerations involve assessing user impact, providing clear upgrade paths, and communicating changes to stakeholders. Critics note potential for breaking changes and user confusion if migration is not well-supported. See also default settings, configuration management, and backward compatibility.