bug#1248: 23.0.60; problems with `color' custom type

[Drew Adams]

emacs -Q
Eval this: (defcustom foo "Red" "..." :type 'color)
 
M-x set-variable foo RET Blue RET
 
gives error "Value `Blue' does not match type color of foo". Likewise,
if I try BlueViolet.
 
M-x customize-option foo
 
Empty the value field and hit M-TAB. The colors are displayed in a
crazy order, not alphabetically. And there is no color `Blue' in the
list. But you can enter the text `Blue' anyway and choose Set for
Session from the menu. So the completion must be lax, which is
good. 
 
But why does `set-variable' say that `Blue' does not match type
`color'? And it says the same thing for `BlueViolet', which is one of
the names available using completion in Customize.
 
And `set-variable' too should offer completion (enhancement request).


In GNU Emacs 23.0.60.1 (i386-mingw-nt5.1.2600)
 of 2008-10-03 on LENNART-69DE564
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4) --no-opt --cflags -Ic:/g/include
-fno-crossjumping'