bug#2317: emacs silently ignores buffer file encoding?

[Miles Bader-4]

(1) Start emacs -Q
(2) Visit "/tmp/fff"
(3) Insert the following chars: "θϑΘ"
(4) Set the buffer file encoding to latin1 with: C-x C-m f latin-1 RET
(5) Save the buffer: C-x C-s

For me, "/tmp/fff" is saved sucessfully, with no error or prompt, using
an encoding of utf-8 -- despite my having explicitly requested latin-1.

This doesn't seem right...

-Miles

--
Patience, n. A minor form of despair, disguised as a virtue.