IFS in function call in herestring for read

[Evan Gates]

setup:
foo() { printf "%q\n" "$IFS" >&2; printf "%s\n" "$*" >&2; }
IFS=: read <<< "$(foo bar baz qux)"

bash 4.2 output:
:
bar:baz:qux

bash 4.3 output:
:
bar baz qux


IFS is still set within the function call, but isn't being used in the
expansion of "$*"

-emg