v25.1.0

• Changed: The --gitignore option now defaults to false, meaning .gitignore patterns are no longer respected when copying source trees by default. The /target directory is still excluded by default through explicit filtering. To restore the previous behavior, use --gitignore=true.

• New: Mutate > to >= and < to <=.

• Changed: Mutate &T to Box::leak(Box::new(...)), instead of a reference to a value, so that mutants aren't unviable due to returning references to temporary values.

• New: --copy-target option allows copying the /target directory to build directories. By default, the target directory is excluded to avoid copying large build artifacts, but --copy-target=true can be used if tests depend on existing build artifacts.

• New: Feature-related options can now be configured in .cargo/mutants.toml: features, all_features, and no_default_features. Command line arguments take precedence over config file settings for boolean options, while features from both sources are combined.

• New: Produce a json schema for the config file with --emit-schema=config to support schema-guided editing. The schema has been proposed to SchemaStore so many editors should in future support it automatically.

• New: The config file path can be specified with the --config option, overriding the default of .cargo/mutants.toml. (The pre-existing --no-config option turns it off.)