CDI 5.0 adds the concept of reserves ("default beans") that Weld needs to implement.

Some impl notes:

• Every bean now needs to carry an information as to whether it is a standard bean or a reserve
• Synth beans can declare reserves as well (BCE, PE)
• Stereotypes can declare reserves
• Reserves need to be enabled via priority
• AfterTypeDiscovery allows access to list of all reserves along with the ability to modify them, much like for alternatives and interceptors
• Bean resolution algorithm will need to be changed to account for reserves