A key in an AttributeMap that constrains its associated value to be of type T. The key is
uniquely defined by its label and type T, represented at runtime by manifest.
In environments that support delegation, looking up this key when it has no associated value
will delegate to the values associated with these keys. The delegation proceeds in order the
keys are returned here.
In environments that support delegation, looking up this key when it has no associated value
will delegate to the values associated with these keys. The delegation proceeds in order the
keys are returned here.
Specifies whether this key is a local, anonymous key (true) or not (false). This is
typically only used for programmatic, intermediate keys that should not be referenced outside
of a specific scope.
Specifies whether this key is a local, anonymous key (true) or not (false). This is
typically only used for programmatic, intermediate keys that should not be referenced outside
of a specific scope.