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And again, since Objective-J is a proper superset of JavaScript

really? what can it do that js can't do?

Being a superset of JavaScript doesn't mean it can do more, it just means that all valid JavaScript is valid Objective-J.

Read his first sentence again:

"There is also the issue that implementing things like method_missing and import are prohibitively difficult without new syntax."

"difficult" has nothing to do with the power of languages

TeX macros are fundamentally as expressive as java.