[patch enhancement 4] bash_completion Use bash features, prefer (( arithmetic expressions )), [[ conditional expressions ]], avoid useless filename globbing trials in [ … ]expressionss

[Sean Farley]

Thanks for the contribution! Overall, these seem fine but I admittedly
didn't do a thorough reading because these patches were
attachments. Please do take a moment to read

http://mercurial.selenic.com/wiki/ContributingChanges

which will guide you on the first line of the commit message and using
the patchbomb extension.