Re: Common function for percent placeholder replacement

>
> How about this new one with variable arguments?


I like this a lot, but I also see merit in Alvaro's PERCENT_OPT variadic,
which at least avoids the two lists getting out of sync.

Initially, I was going to ask that we have shell-quote-safe equivalents of
whatever fixed parameters we baked in, but this allows the caller to do
that as needed. It seems we could now just copy quote_identifier and strip
out the keyword checks to get the desired effect. Has anyone else had a
need for quote-safe args in the shell commands?