The index is Floating point, not Alpha. There is no .10 because there are no trailing 0's
You can format the series in the file name template when sending, but internally it is sill a number
I pad the fractional (only when indicating an omnibus)
2.05 (means Vols 2-5. even then it falls apart on a few edge cases. eg 2-10)
Some thins you live with as the other also has issues (ASCII sort)
2
20
3
300