[rules-users] Why Using "from" Always Return A New Fact?

[hyjshanghai]

"The general advice as of now is still to avoid using "from" with
"lock-on-active", but I expect that restriction to be lifted in drools 6." 
- I think this is the ultimate advice, we, as users, should take.

Thank you for so much explanation on the internal. I will ask more on the
internal if time permits in the future.
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