How does RHDM/BRMS work when types are mismatched in a rule condition

Issue

• When there is a type mismatch (e.g. String vs Integer) in a constraint, sometimes the condition matches, sometimes not. What's the difference?

rule "R1"
    when
        MyFactA( $i : intData )
        $f : MyFactB( strData == $i )
    then
        System.out.println( "R1 fired : $f = " + $f );
end

rule "R2"
    when
        $f : MyFactB( strData == 20 )
    then
        System.out.println( "R2 fired : $f = " + $f );
end