change to try-completion behavior in 21.3?

[bigfaceworm@gmail.com]

My company has some RedHat systems (32 bit) and some 64-bit Suse
systems.
The Emacs on the two is behaving differently, and

64-bit version: 21.3.50.1
32-bit version: 21.3.1

The try-completion reacts differently to completion-ignore-case.

This code snippet:

(cons
 (let ((completion-ignore-case nil))
   (try-completion "w" ex-token-alist))
 (let ((completion-ignore-case t))
   (try-completion "w" ex-token-alist)))

Returns
("w" . "w") on the 32-bit machine

returns
("w" . "W") on the 64-bit machine

Is this expected (new) behavior?
Or did the computing support screw up the build/install?

Why should it ever return the capital letter W?

thanks,

BFW

ps. I don't use viper, a friend does and I'm helping him out.
pps. ex-token-alist is defined in viper-ex.el as:

(defconst ex-token-alist '(
	("!"			(ex-command))
	("&"			(ex-substitute t))
	("="			(ex-line-no))
	(">"			(ex-line "right"))
	("<"			(ex-line "left"))
	("Buffer"		(if ex-cycle-other-window
				    (viper-switch-to-buffer)
				  (viper-switch-to-buffer-other-window)))
	("Next"			(ex-next (not ex-cycle-other-window)))
	("PreviousRelatedFile"  (ex-next-related-buffer -1))
	("RelatedFile"	    	(ex-next-related-buffer 1))
	("W"			"Write")
	("WWrite"		(save-some-buffers t))
	("Write"		(save-some-buffers))
	("a"			"append")
	("args"			(ex-args))
	("buffer"		(if ex-cycle-other-window
				    (viper-switch-to-buffer-other-window)
				  (viper-switch-to-buffer)))
	("c"			"change")
	;; ch should be "change" but maintain old viper compatibility
	("ch"			"chdir")
	("cd"			(ex-cd))
	("chdir"		(ex-cd))
	("copy"			(ex-copy nil))
	("customize"	    	(customize-group "viper"))
	("delete"		(ex-delete))
	("edit"			(ex-edit))
	("file"			(ex-set-visited-file-name))
	("g"			"global")
	("global"		(ex-global nil) is-mashed)
	("goto"			(ex-goto))
	("help"			(ex-help))
	("join"			(ex-line "join"))
	("k"			(ex-mark) one-letter)
	("kmark"		(ex-mark))
	("m"			"move")
	("make"     	    	(ex-compile))
	; old viper doesn't specify a default for "ma" so leave it undefined
	("map"			(ex-map))
	("mark"			(ex-mark))
	("move"			(ex-copy t))
	("next"			(ex-next ex-cycle-other-window))
	("p"			"print")
	("preserve"		(ex-preserve))
	("print"		(ex-print))
	("put"			(ex-put))
	("pwd"			(ex-pwd))
	("quit"			(ex-quit))
	("r"			"read")
	("re"			"read")
	("read"			(ex-read))
	("recover"		(ex-recover))
	("rewind"		(ex-rewind))
	("s"			"substitute")
	("su"			"substitute")
	("sub"			"substitute")
	("set"			(ex-set))
	("shell"		(ex-shell))
	("source"		(ex-source))
	("stop"			(suspend-emacs))
	("sr"			(ex-substitute t t))
	("submitReport"	    	(viper-submit-report))
	("substitute"	    	(ex-substitute) is-mashed)
	("suspend"		(suspend-emacs))
	("t"			"transfer")
	("tag"			(ex-tag))
	("transfer"		(ex-copy nil))
	("u"			"undo")
	("un"			"undo")
	("undo"			(viper-undo))
	("unmap"		(ex-unmap))
	("v"			"vglobal")
	("version"		(viper-version))
	("vglobal"		(ex-global t) is-mashed)
	("visual"		(ex-edit))
	("w"			"write")
	("wq"			(ex-write t))
	("write"		(ex-write nil))
	("xit"			(ex-write t))
	("yank"			(ex-yank))
	("~"			(ex-substitute t t))

	("append"		(ex-cmd-obsolete "append"))
	("change"		(ex-cmd-obsolete "change"))
	("insert"		(ex-cmd-obsolete "insert"))
	("open"			(ex-cmd-obsolete "open"))

	("list"			(ex-cmd-not-yet "list"))
	("z"			(ex-cmd-not-yet "z"))
	("#"			(ex-cmd-not-yet "#"))

	("abbreviate"	    	(error "`%s': Vi abbreviations are obsolete.  Use
the more powerful Emacs abbrevs" ex-token))
	("unabbreviate"	    	(error "`%s': Vi abbreviations are obsolete.  Use
the more powerful Emacs abbrevs" ex-token))
	))