[pro] AMOP question: When and where is slot-value-using-class called?

[Steve Haflich]

I'm typing on a phone in a dog park. Expect brevity and typos.

Why do think one or another behavior is incorrect? slot-value is required
only to return the correct value (etc.) if all the metaobjects are of
classes "specified" in the standard. The MOP prohibits you from changing or
extending MOP gfs when all the discriminating args are of specified
classes. If you use customized class or slot-definition metaclasses then
slot-value needs to obey some or all of the full slot-value-using-class
protocol, but otherwise your code cannot legally change what s-v does or
returns.

This is spelled out somewhere in the MOP in a section on restrictions on
user code or something like that.
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