code: def xeval(source, optimize=True):
      
      native = xcompile(source, optimize=optimize)
      return native()
docs: Compiles to native Python bytecode and runs program, returning the
      topmost value on the stack.
  
      Args:
          optimize: Whether to optimize the code after parsing it.
  
      Returns:
          None: If the stack is empty
          obj: If the stack contains a single value
          [obj, obj, ...]: If the stack contains many values