> In SRFI 159,
> which is already part of R7RS-large, there is a formatter that
> can insert any chosen character every N digits.  The forthcoming
> SRFI 166 is meant to be a replacement and will be voted on
> in a future R7RS ballot: it adds the ability to insert characters
> in variable places, as required in India.

SRFI 166 is impressive work! Could the underscore syntax proposed in
this 169 be printed by using comma-sep from 166? What's the equivalent
thing in 159?

Is 166 going to be tied into the R7RS-large printer if it passes the
vote? Is 159 currently tied to it?

In light of 159 and 166 existing, would you recommend specifying
anything at all about printing in this new 169? I have basically no
qualifications to be making decisions like that.