the following expressions all evaluate to NaN:

+[]
+[1]
+[1,2,3]

They should evaluate to 0, 1, NaN respectively.

It looks like somewhere the array literal node is replaced with a NaN constant as the generated bytecode always looks like this:

    LDC NaN
    INVOKESTATIC java/lang/Double.valueOf (D)Ljava/lang/Double;