[rules-users] Inconsistent behavior of a rule

[dec]

See attached DRL. input is: condFt="supportedValue" 
I have a rule with the following 'when' part which will not hit, though it
should: 

                $supportFT: supportFT() 
                condFT(value == $supportFT.getValue())   
                $conclusion: testInferred() 

while the following one will hit, even though the two seems equivalent: 

                $supportFT: supportFT(value == null || value !=null) 
                condFT(value == $supportFT.getValue())   
                $conclusion: testInferred() 

another one that seems equivalent that will hit: 
                $supportFT: supportFT() 
                supportFT(value == $condFt.getValue())   
                $conclusion: testInferred() 

Not sure if it is indeed a bug, or a misuse on my part, 
but I can't understand why the first rule will not hit. And even stranger,
why the second and third which seems the same will. 

testInferred3.drl
<http://drools.46999.n3.nabble.com/file/n4021003/testInferred3.drl>  



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