5.2.3. Assignability of raw and parameterized types:
"A parameterized bean type is considered assignable to a parameterized required type if they have identical raw type and for each parameter

• ...
• the required type parameter and the bean type parameter are both type variables and the upper bound of the required type parameter is assignable to the upper bound, if any, of the bean type parameter."

See org.jboss.cdi.tck.tests.lookup.typesafe.resolution.parameterized.AssignabilityOfRawAndParameterizedTypesTest.testAssignabilityOfParameterizedTypeWithTypeVariablesToParameterizedTypeTypeVariable()