pickaxe2 lists module_eval as an instance method of Module.  But:

num = 10
puts Object.module_eval('num')
---> 10

puts self
-->main

puts self.class
-->Object

puts self.module_eval('num')
undefined method `module_eval' for main:Object (NoMethodError)


1) Why am I able to call module_eval with a class name, i.e. Object?

2) Why can't I call module_eval with an instance of Object?
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