Start to plan this feature.
Add mapper to help with storing mutants to disk.
Added YamlStore to help with storing mutants to disk.
Reformat FileSystem helper.
Change Mutant to accept a hash of attributes on construction, rather than positional arguments.
Implement ExampleMapper.
Implement ResultMapper.
Moved store specs to correct directory.
Prefer key_struct gem to bespoke attributable mixin.
Reinstate suite inspector tests.
Push test_suite_runner down into RSpec module.
Add inspect methods to value objects.
Have test runners consume Mutant and produce Result value objects.
Fix suite_inspector_spec to use the eq matcher (equal objects) rather than the be matcher (same objects).
Bring Results under test.
Add mechanism for recording whether a Mutant is alive or has been killed.
Bring MutationTestRunner under test.
Change results to use the new mutable version of Mutant.
Rename Results to Mutants.
Pull up creation of Mutants to CommandLine.