Well, it had to happen eventually...

I have been running advice on internal reader functions. Yep, non-portable programming. 

SBCL finally did away with the function being advised, having totally rewritten their reader for the latest versions. Same will likely happen someday with Lispworks.

At issue, I want to write long strings of digits with intervening underscore chars, like this: 1_000_000 for 1 million. The underscore helps me to not go cross-eyed counting out the number of digits. It carries no significance but just makes programming into a human friendly endeavor.

So, I put it to the expert audience - where would an advice make the most sense on the Lisp reader?

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