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Javascript was mentioned in the talk; because of its weak typing and plenty of APIs that take strings, floating point printing is pretty common.

Often, numbers in JS happen to be just integers. Would the implementation optimize for that case?

Javascript JITs specialize for integers already. I don't know if Ryū does specifically though.

It doesn't optimize for ints right now. I thought about that, but haven't tried it yet.

That's really sad.

Why? Did you forget to read the implied "just like any other language that's being used in a graphical context, where live numbers need to be shown"?