$simprobe

I was just reading the draft LRM and came across $simprobe. There needs
to be some restriction on this function otherwise it could generate
nasty convergence issues. Basically, it is granting access to signal
dependent quantities without passing derivative information. It must
somehow constrained so that it can only be used in situations where the
derivative is not needed, such as in conditionals, crosses, strobes, and
the like.

If it cannot be restricted, it should be removed.

-Ken


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