After some serious research, I've come to agree with the determination of this post:
https://www.uglyhedgehog.com/t-343636-1.html#5767274 (https://www.uglyhedgehog.com/t-343636-1.html#5767274)
Hereby and henceforth, i propose that for the value of "4294967295" in xmp-aux approximatefocusdistance be decoded as "Infinity." that value is very common.
what say ye?
- J
OK. I'll do that. Note that the more natural way to store infinity in a rational value is 1/0, which is what ExifTool writes if you set the value to "inf". But I'll add a special case for 4294967295 to be converted to/from "infinity".
- Phil