bug? {1..3} doesnt' use IFS to separate fields

[Linda Walsh]

I know it wasn't designed this way, but it seems like it
is a bug.


If I do
  read a b c <<<$(echo {1..3} ); echo "a:$a b:$b c:$c"
I get:
  a:1 b:2 c:3

But If I do
  export IFS=','; read a b c <<<$(echo {1..3} ); echo "a:$a b:$b c:$c"
I get:
  a:1 2 3 b: c:

Why should the 2nd case return the wrong answer?
I.e. shouldn't {1..3} use the IFS to separate arguments?