The sentence If a key is duplicated, a parser SHOULD reject.is not a change. It is implied by the first statement.
I do not agree. A 'should' authoring requirement is not meant to trigger an abortion from the execution engine.
For example, the CSS flexbox spec says that an author should not use the CSS 'order' property to convey any semantic meaning, but that doesn't mean the browser will reject the 'order' declaration if it detects the way it's used is not semantically valid. A 'should' is nothing more than an advice to the author, not a requirement per se.
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