bug#6581: 24.0.50; `equal-including-properties' uses `eq' to compare property values

[Christian Ohler]

I just noticed that, in my current Emacs (24.0.50.1, built from trunk a 
few weeks ago):

(equal-including-properties #("a" 0 1 (k "v")) #("a" 0 1 (k "v")))
=> nil

This is because these two strings both have a property with key `k', but 
the values are two different strings "v", and 
`equal-including-properties' appears to use `eq' to compare property 
values (I didn't verify this in the code).  Is this a bug, or is it 
intentional?

For comparison,

(equal-including-properties #("a" 0 1 (k v)) #("a" 0 1 (k v)))
=> t

since `v' is an interned symbol.

My expectation was that, since `equal' is recursively defined in terms 
of itself, `equal-including-properties' should also call itself 
recursively on property values.

Christian.