discrepancy with variable assignments and simple commands between sh and bash

[Mike Frysinger]

i'm finding that the `var=val cmd` syntax isnt working the same between `sh` 
and `bash` when the simple command is a function.  this is bash-4.1_p7, but 
testing some older ones seems to behave the same.  i'm not sure if this is "by 
design" or a bug ... 

simple example:
$ cat test.sh
unset a
a=a
echo e1 a=$a
a=b env | grep ^a=
echo e2 a=$a
f() { echo a=$a; }
a=c f
echo e3 a=$a

when run with `bash`, i get:
e1 a=a
a=b
e2 a=a
a=c
e3 a=a

however, when i execute with `sh` (a symlink to bash), i get:
e1 a=a
a=b
e2 a=a
a=c
e3 a=c

the difference here being the value in variable "a" after function "f" 
finishes executing.  i was expecting the behavior of `bash`, not of `sh`.  i 
cant seem to find anything covering this in the man page except for perhaps 
interpreting the meaning of some sections to mean this behavior is allowed.  
but i certainly didnt locate anything that would imply behavior of this would 
differ across bash and sh ...
-mike

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