diff --git a/moo/kernel/System.moo b/moo/kernel/System.moo
index 1de7d72..b524dc0 100644
--- a/moo/kernel/System.moo
+++ b/moo/kernel/System.moo
@@ -148,7 +148,7 @@ class System(Apex)
 
 	method(#class) __os_sig_handler: caller
 	{
-		| os_intr_sem tmp sh |
+		| os_intr_sem signo sh |
 
 		os_intr_sem := Semaphore new.
 		os_intr_sem signalOnInput: System _getSigfd.
@@ -156,23 +156,23 @@ class System(Apex)
 		[
 			while (true)
 			{
-				until ((tmp := self _getSig) isError)
+				until ((signo := self _getSig) isError)
 				{
 					// TODO: Do i have to protected this in an exception handler???
-					//TODO: Execute Handler for tmp.
+					//TODO: Execute Handler for signo.
 
-					System logNl: 'Interrupt dectected - signal no - ' & tmp asString.
+					System logNl: 'Interrupt dectected - signal no - ' & signo asString.
 
 					// user-defined signal handler is not allowed for 16rFF
-					if (tmp == 16rFF) { goto done }. 
+					if (signo == 16rFF) { goto done }. 
 
 					ifnot (self.shr isEmpty)
 					{
-						self.shr do: [ :handler | handler value ]
+						self.shr do: [ :handler | handler value: signo ]
 					}
 					else
 					{
-						if (tmp == 2) { goto done }.
+						if (signo == 2) { goto done }.
 					}.
 				}.
 				os_intr_sem wait.
diff --git a/moo/kernel/X11.moo b/moo/kernel/X11.moo
index 7be4848..451a025 100644
--- a/moo/kernel/X11.moo
+++ b/moo/kernel/X11.moo
@@ -810,6 +810,7 @@ class MyObject(Object)
 	method initialize
 	{
 		self.on_sig := [:sig | 
+'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXx' dump.
 			self.disp1 requestToExit.
 			self.disp2 requestToExit.
 		].
diff --git a/moo/lib/exec.c b/moo/lib/exec.c
index 9ca6194..56d54e9 100644
--- a/moo/lib/exec.c
+++ b/moo/lib/exec.c
@@ -2221,7 +2221,19 @@ static moo_pfrc_t pf_hash (moo_t* moo, moo_mod_t* mod, moo_ooi_t nargs)
 					default:
 						/* MOO_OBJ_TYPE_OOP, ... */
 						moo_seterrbfmt(moo, MOO_ENOIMPL, "no builtin hash implemented for %O", rcv); /* TODO: better error code? */
-						return MOO_PF_FAILURE;
+						switch (MOO_OBJ_GET_FLAGS_HASH(rcv))
+						{
+							case 0:
+								MOO_OBJ_SET_FLAGS_HASH (rcv, 1);
+								/* fall thru */
+							case 1:
+								hv = (moo_oow_t)rcv;
+								break;
+
+							case 2:
+								hv = *(moo_oow_t*)((moo_uint8_t*)rcv + MOO_SIZEOF(moo_obj_t) + moo_getobjpayloadbytes(moo, rcv) - MOO_SIZEOF(moo_oow_t));
+								break;
+						}
 				}
 			}
 			break;
diff --git a/moo/lib/gc.c b/moo/lib/gc.c
index 35a7b97..3c99489 100644
--- a/moo/lib/gc.c
+++ b/moo/lib/gc.c
@@ -726,10 +726,12 @@ static void compact_symbol_table (moo_t* moo, moo_oop_t _nil)
 	moo->symtab->tally = MOO_SMOOI_TO_OOP(tally);
 }
 
-static MOO_INLINE moo_oow_t get_payload_bytes (moo_t* moo, moo_oop_t oop)
+moo_oow_t moo_getobjpayloadbytes (moo_t* moo, moo_oop_t oop)
 {
 	moo_oow_t nbytes;
 
+	MOO_ASSERT (moo, MOO_OOP_IS_POINTER(oop));
+
 	if (MOO_OBJ_GET_FLAGS_TRAILER(oop))
 	{
 		/* only an OOP object can have the trailer. 
@@ -749,7 +751,6 @@ static MOO_INLINE moo_oow_t get_payload_bytes (moo_t* moo, moo_oop_t oop)
 		MOO_ASSERT (moo, MOO_OBJ_GET_FLAGS_EXTRA(oop) == 0); /* no 'extra' for an OOP object */
 
 		nbytes = MOO_OBJ_BYTESOF(oop) + MOO_SIZEOF(moo_oow_t) + MOO_OBJ_GET_TRAILER_SIZE(oop);
-	
 	}
 	else
 	{
@@ -757,9 +758,14 @@ static MOO_INLINE moo_oow_t get_payload_bytes (moo_t* moo, moo_oop_t oop)
 		nbytes = MOO_OBJ_BYTESOF(oop);
 	}
 
-	if (MOO_OBJ_GET_FLAGS_HASH(oop) == 2) nbytes += MOO_SIZEOF(moo_oow_t);
+	nbytes = MOO_ALIGN(nbytes, MOO_SIZEOF(moo_oop_t));
+	if (MOO_OBJ_GET_FLAGS_HASH(oop) == 2) 
+	{
+		MOO_STATIC_ASSERT (MOO_SIZEOF(moo_oop_t) == MOO_SIZEOF(moo_oow_t));
+		nbytes += MOO_SIZEOF(moo_oow_t);
+	}
 
-	return MOO_ALIGN(nbytes, MOO_SIZEOF(moo_oop_t));
+	return nbytes;
 }
 
 moo_oop_t moo_moveoop (moo_t* moo, moo_oop_t oop)
@@ -782,13 +788,19 @@ moo_oop_t moo_moveoop (moo_t* moo, moo_oop_t oop)
 	}
 	else
 	{
-		moo_oow_t nbytes_aligned;
+		moo_oow_t nbytes_aligned, extra_bytes = 0;
 		moo_oop_t tmp;
 
-		nbytes_aligned = get_payload_bytes(moo, oop);
+		nbytes_aligned = moo_getobjpayloadbytes(moo, oop);
+
+		if (MOO_OBJ_GET_FLAGS_HASH(oop) == 1)
+		{
+			MOO_STATIC_ASSERT (MOO_SIZEOF(moo_oop_t) == MOO_SIZEOF(moo_oow_t)); /* don't need explicit alignment */
+			extra_bytes = MOO_SIZEOF(moo_oow_t); /*  MOO_ALIGN(MOO_SIZEOF(moo_oow_t), MOO_SIZEOF(moo_oop_t)); */
+		}
 
 		/* allocate space in the new heap */
-		tmp = moo_allocheapspace(moo, &moo->heap->newspace, MOO_SIZEOF(moo_obj_t) + nbytes_aligned);
+		tmp = moo_allocheapspace(moo, &moo->heap->newspace, MOO_SIZEOF(moo_obj_t) + nbytes_aligned + extra_bytes);
 
 		/* allocation here must not fail because
 		 * i'm allocating the new space in a new heap for 
@@ -810,6 +822,12 @@ moo_oop_t moo_moveoop (moo_t* moo, moo_oop_t oop)
 		 * the 'if' block at the top of this function. */
 		MOO_OBJ_SET_CLASS (oop, tmp);
 
+		if (extra_bytes)
+		{
+			MOO_OBJ_SET_FLAGS_HASH (tmp, 2);
+			*(moo_oow_t*)((moo_uint8_t*)tmp + MOO_SIZEOF(moo_obj_t) + nbytes_aligned) = (moo_oow_t)oop;
+		}
+
 		/* return the new object */
 		return tmp;
 	}
@@ -826,18 +844,8 @@ static moo_uint8_t* scan_heap_space (moo_t* moo, moo_uint8_t* ptr, moo_uint8_t**
 		oop = (moo_oop_t)ptr;
 		MOO_ASSERT (moo, MOO_OOP_IS_POINTER(oop));
 
-		nbytes_aligned = get_payload_bytes(moo, oop);
+		nbytes_aligned = moo_getobjpayloadbytes(moo, oop);
 
-/*
-if (MOO_OBJ_GET_HASH_FLAGS(oop) == 1)
-{
-TODO: use the unaligned bytes and align after this addition 
-	nbytes_aligned += MOO_SIZEOF(moo_oow_t);
-
-change the hash flags to 2.
-store the  existing address to the extra hash field 
-}
-*/
 		tmp = moo_moveoop(moo, (moo_oop_t)MOO_OBJ_GET_CLASS(oop));
 		MOO_OBJ_SET_CLASS (oop, tmp);
 
@@ -1109,7 +1117,7 @@ moo_oop_t moo_shallowcopy (moo_t* moo, moo_oop_t oop)
 		moo_oop_t z;
 		moo_oow_t total_bytes;
 
-		total_bytes = MOO_SIZEOF(moo_obj_t) + get_payload_bytes(moo, oop);
+		total_bytes = MOO_SIZEOF(moo_obj_t) + moo_getobjpayloadbytes(moo, oop);
 
 /* TODO: exclude trailer and hash space? exclde hash space at least? */
 
diff --git a/moo/lib/moo-prv.h b/moo/lib/moo-prv.h
index cd54fbe..87671bf 100644
--- a/moo/lib/moo-prv.h
+++ b/moo/lib/moo-prv.h
@@ -1251,6 +1251,8 @@ int moo_regfinalizable (moo_t* moo, moo_oop_t oop);
 int moo_deregfinalizable (moo_t* moo, moo_oop_t oop);
 void moo_deregallfinalizables (moo_t* moo);
 
+moo_oow_t moo_getobjpayloadbytes (moo_t* moo, moo_oop_t oop);
+
 /* ========================================================================= */
 /* bigint.c                                                                  */
 /* ========================================================================= */