is an early reference to transitively immutable.
I transmogrify a point made there that seeing the private RSA key of a bank leads to
the ability to cause great mischief even though it is highly immutable.
Here are some possible meanings:
It seems clear that this list is neither orthogonal nor exhaustive.
The sensory key is number 3.
With a requestor's key to a discreet factory, one can gain access to mutable objects but it is nonetheless incapable of providing egress for data, for the mutable object is itself confined.
- Access to something that is guaranteed to be the same in the future as it is now.
- Access via which you cannot cause a thing to change. (read-only)
- Access via which you cannot cause a thing to change but can acquire access like this. (sensory)
- Access to something unchangable in one or both of the above senses, but via which
you can acquire access which does not conform to any of these limitations.
I won't propose terms for these but dead end might be a category for the factory requestor's key.