Appended numbers should be 0-9, not 1-10

[John VDL]

This is more consistent: the extra number is 1 character long, and covers every digit (instead of leaving out 0 for 10).

imported from github

[John VDL]

Fix #2 - random appended number should be from 0-9 not 1-10 (flooring the generated number rather than ceiling it now)

→ <<cset 5377dfe3bf6a>>