Discard or clear mutator

[nmmmnu]

Would be nice, if there is a method that clears all en-queued actions in the Mutator object.

$mut->insert(); $mut->insert(); ... $mut->discard();

This is different issue, but I also don't see a reason to give pool to the Mutator, if the pool can be set from the pool of first CF / SCF you en-queue.