attempting to polymorph into a unique monster

Noticed while testing revised "the" handling and trying to trigger
"you can't polymorph into [the] Oracle", if the character was human
it would turn into a new man or woman instead of having the unique
form be rejected.

doc/fixes37.0

@@ -688,6 +688,9 @@ if hero is wearing an amulet of magical breathing and polymorphs into a fish
 	or sea monster, don't lose health for turns spent out of water
 fix up some "the" handling for monsters whose type name is upper case to avoid
 	"Uruk-hai is healthy for a statue", "You can't polymorph into Oracle"
+controlled polymorph would turn hero into new man or woman if player asked to
+	become a unique monster of the same race (so usually human) instead of
+	being told that polymorphing into the specified form wasn't allowed
 
 
 Fixes to 3.7.0-x Problems that Were Exposed Via git Repository

src/polyself.c

@@ -478,8 +478,11 @@ polyself(int psflags)
             } else if (!polyok(&mons[mntmp])
                        /* Note:  humans are illegal as monsters, but an
                           illegal monster forces newman(), which is what
-                          we want if they specified a human.... */
+                          we want if they specified a human.... (unless
-                       && !(mntmp == PM_HUMAN || your_race(&mons[mntmp])
+                          they specified a unique monster) */
+                       && !(mntmp == PM_HUMAN
+                            || (your_race(&mons[mntmp])
+                                && (mons[mntmp].geno & G_UNIQ) == 0)
                             || mntmp == g.urole.malenum
                             || mntmp == g.urole.femalenum)) {
                 const char *pm_name;