Incorrect mkNumericExpr implementation

[CaelmBleidd]

There are several rules for variables transformation into a number. For now, only few of them are supported.

    7.1.4 ToNumber ( argument )
    
    1. If argument is a Number, return argument.
    **2. If argument is either a Symbol or a BigInt, throw a TypeError exception.**
    3. If argument is undefined, return NaN.
    4. If argument is either null or false, return +0𝔽.
    5. If argument is true, return 1𝔽.
    **6. If argument is a String, return StringToNumber(argument).**
    7. Assert: argument is an Object.
    **8. Let primValue be ToPrimitive(argument, "number").**
    **9. Assert: primValue is not an Object.**
    **10. Return ToNumber(primValue).**

Now for objects it always returns NaN which is incorrect, for example, for [0] or objects with toString returning a string with a number inside.