Address the FIXME in MathObject::max to handle an arbitrary
number of arguments. Also adding a test case to verify the
behavior of Math.max() while I'm here.
- An empty string is converted to 0
- An empty array is converted to 0
- An array with one item is converted to that item's numeric value
- An array with more than one item is converted to NaN
Instead of implementing every native function as a lambda function,
use static member functions instead.
This makes it easier to navigate the code + backtraces look nicer. :^)
Native functions now only get the Interpreter& as an argument. They can
then extract |this| along with any indexed arguments it wants from it.
This forces functions that want |this| to actually deal with calling
interpreter.this_value().to_object(), and dealing with the possibility
of a non-object |this|.
This is still not great but let's keep massaging it forward.