[Info-vax] DIRECTORY: bug or feature

[Phillip Helbig---undress to reply]

The command

   $  DIR []*.AA,*.AB 

shows the same output as 

   $  DIR []

if only *.AA and *.AB are in the directory.  Ditto for

   $  DIR []*.A*

Extending this,

   $  DIR [...]*.A*

produces similar results.  However,

   $  DIR [...]*.AA,*.AB

will list directories twice, once with *.AA and then again with *.AB.

Has the behaviour always been this way?

Bug or feature?

Wouldn't things be more logical if the second and fourth commands 
produced the same output, since the first and third do?