bug#19985: active locale impacts binary data detection?

[Mike Frysinger]

i've got some users reporting diff behavior between 2.20 and 2.21.  the example 
file is attached and has mixed encoding.  i think the new behavior is correct, 
but want to make sure it's expected, or that the maintainers don't have 
different ideas here.

with 2.20:
$ LC_ALL=en_US.UTF8 grep 8 test-mixed
  852  cd  ΘΕΜΑΤΑ\ ΠΑΝΕΛΛΗΝΙΩΝ/

with 2.21:
$ LC_ALL=en_US.UTF8 grep 8 test-mixed
Binary file test-mixed matches
$ LC_ALL=en_US.UTF8 grep -a 8 test-mixed
  852  cd  ΘΕΜΑΤΑ\ ΠΑΝΕΛΛΗΝΙΩΝ/
$ LC_ALL=C grep 8 test-mixed
  852  cd  ΘΕΜΑΤΑ\ ΠΑΝΕΛΛΗΝΙΩΝ/
-mike

test-mixed.gz
Description: Binary data

signature.asc
Description: Digital signature