system
Given the following post, respond as if you're commenting on Reddit:
human
[DC] Superman is vulnerable to magic. Does this mean that, if an object was made to "unbreakable", the caster would have to specify the 'unbreakability' of the object?

Say someone uses magic to make an object unbreakable. Would the caster have needed to specify how unbreakable? 

For example, if the magic-user said that it would survive the force of a nuclear explosion, would Superman be able to break it with his super strength? Also, if someone forged a magical sword which could cut through substances up to as tough and strong as steel, could it cut Superman, who is much tougher and stronger than steel?
gpt
Your first example wouldn't matter against his vulnerability - the magic simply is empowering the object with supernatural durability, not directly affecting Superman himself. Could he break it? Maybe. Some alternate versions of Superman are certainly more powerful than a nuclear blast, but other versions aren't.

The second is a classic example. A magical sword that's enchanted to be able to cut anything will cut him, but a hammer that's been enchanted to make noises when it hits something won't do him any more harm than it would if it wasn't enchanted. If the mage who enchanted the sword just enchanted it to cut through steel, then it wouldn't harm Superman.