The first bug is in the bash(1) man page. In the SHELL GRAMMAR ->
Compound Commands -> [[ expression ]] section: "The return value is
0 if the string matches or does not match the pattern, respectively,
and 1 otherwise." This sentence is unclear. It is likely that
"respectively" maps "matches" and "does not match" to the operators ==
and !=, repectively. This should be better expressed in the man page.
The second bug is that {x..y} only makes sense if both x and y are
{numbers,lower-case letters,upper-case letters}. {a..A} should be
invalid and resolve to {a..A}, but instead it sequences backwards: "a
_ ^ ] [ Z Y ... A". This is allowed, I am supposing, by a
simplistic typing mechanism, in which there are just two types:
numbers and letters. However this is too simplistic and should be
changed.
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