executable-model fails with "from" and ternary expression

rule R
  when
    $foo: Number()
    $bar: Boolean() from ($foo > 0 ? true : false)
  then
end

java.lang.UnsupportedOperationException
	at org.drools.model.codegen.execmodel.generator.expressiontyper.ExpressionTyper.toTypedExpressionRec(ExpressionTyper.java:386)
	at org.drools.model.codegen.execmodel.generator.expressiontyper.ExpressionTyper.toTypedExpression(ExpressionTyper.java:161)
	at org.drools.model.codegen.execmodel.generator.drlxparse.ConstraintParser.compileToJavaRecursive(ConstraintParser.java:292)
	at org.drools.model.codegen.execmodel.generator.drlxparse.ConstraintParser.compileStart(ConstraintParser.java:200)
	at org.drools.model.codegen.execmodel.generator.drlxparse.ConstraintParser.drlxParse(ConstraintParser.java:150)
	at org.drools.model.codegen.execmodel.generator.drlxparse.ConstraintParser.drlxParse(ConstraintParser.java:142)
	at org.drools.model.codegen.execmodel.generator.drlxparse.ConstraintParser.drlxParse(ConstraintParser.java:138)
	at org.drools.model.codegen.execmodel.generator.visitor.FromVisitor.createArg(FromVisitor.java:282)
	at org.drools.model.codegen.execmodel.generator.visitor.FromVisitor.addLambdaToFromExpression(FromVisitor.java:264)
	at org.drools.model.codegen.execmodel.generator.visitor.FromVisitor.fromExpressionUsingArguments(FromVisitor.java:199)
	at org.drools.model.codegen.execmodel.generator.visitor.FromVisitor.lambda$1(FromVisitor.java:140)
...