When dumping out the contents of a Conf, it's useful not to have to
guess what the integer indices mean.
By putting these identifiers in a separate array in its own library
module, I should avoid them getting linked in to production binaries
to take up space, as long as conf_id() is only called from inside
debug() statements. And to enforce _that_, it isn't even declared in a
header file unless you #define DEBUG.
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