Could there be a way to disable LOAD-PREFERENCES?

Hi,

Could there be a simple way to disable the preference loading
machinery in ASDF?  I don't care much about the interface (a special
variable, an initarg to OPERATE, etc.), but IMO it's important to be
able to use ASDF to build things in an environment that's free from
user customizations.

Here's the specific problem: SBCL uses ASDF as part of its build
process, and so if a user has things at ~/.asdf, then preference
loading can either fail or pull in user customizations that can break
SBCL's building or self-testing.

Thanks,
RmK


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