Package-level declarations

Marks this feature as discouraged. If it is possible to complete the operation without using the feature, this will be done. The feature will only be used if its use is required to allow the operation to succeed.

The meta functionality that enables us to easily create DSLs.

Tri-state setting for enabling a given feature.

Marks this feature as preferred. If the feature is available on the current platform and with the specified configuration, it will be used. If not, it will silently not be used. The effective state might be determined from the output.

Marks this feature as non-negotiable and absolutely required. If the feature is not available on the current platform, the operation may fail.