diff --git a/moo/lib/bigint.c b/moo/lib/bigint.c
index e04b19c..d43ca01 100644
--- a/moo/lib/bigint.c
+++ b/moo/lib/bigint.c
@@ -272,7 +272,7 @@ static int is_normalized_integer (moo_t* moo, moo_oop_t oop)
 			sz = MOO_OBJ_GET_SIZE(oop);
 			MOO_ASSERT (moo, sz >= 1);
 
-			return MOO_OBJ_GET_LIWORD_SLOT(oop)[sz - 1] == 0? 0: 1;
+			return MOO_OBJ_GET_LIWORD_VAL(oop, sz - 1) == 0? 0: 1;
 		}
 	}
 
@@ -590,7 +590,7 @@ static MOO_INLINE moo_oop_t make_bloated_bigint_with_ooi (moo_t* moo, moo_ooi_t
 	}
 
 	if (!z) return MOO_NULL;
-	MOO_OBJ_GET_LIWORD_SLOT(z)[0] = w;
+	MOO_OBJ_SET_LIWORD_VAL (z, 0, w);
 	return z;
 
 #elif (MOO_LIW_BITS == MOO_OOHW_BITS)
@@ -616,8 +616,8 @@ static MOO_INLINE moo_oop_t make_bloated_bigint_with_ooi (moo_t* moo, moo_ooi_t
 	}
 
 	if (!z) return MOO_NULL;
-	MOO_OBJ_GET_LIWORD_SLOT(z)[0] = hw[0];
-	if (hw[1] > 0) MOO_OBJ_GET_LIWORD_SLOT(z)[1] = hw[1];
+	MOO_OBJ_SET_LIWORD_VAL (z, 0, hw[0]);
+	if (hw[1] > 0) MOO_OBJ_SET_LIWORD_VAL (z, 1, hw[1]);
 	return z;
 #else
 #	error UNSUPPORTED LIW BIT SIZE
@@ -694,7 +694,7 @@ static MOO_INLINE moo_oop_t expand_bigint (moo_t* moo, moo_oop_t oop, moo_oow_t
 
 	for (i = 0; i < count; i++)
 	{
-		MOO_OBJ_GET_LIWORD_SLOT(z)[i] = MOO_OBJ_GET_LIWORD_SLOT(oop)[i];
+		MOO_OBJ_SET_LIWORD_VAL (z, i, MOO_OBJ_GET_LIWORD_VAL(oop, i));
 	}
 	return z;
 }
@@ -715,7 +715,7 @@ static MOO_INLINE moo_oop_t _clone_bigint (moo_t* moo, moo_oop_t oop, moo_oow_t
 
 	for (i = 0; i < count; i++)
 	{
-		MOO_OBJ_GET_LIWORD_SLOT(z)[i] = MOO_OBJ_GET_LIWORD_SLOT(oop)[i];
+		MOO_OBJ_SET_LIWORD_VAL (z, i, MOO_OBJ_GET_LIWORD_VAL(oop, i));
 	}
 	return z;
 }
diff --git a/moo/mod/ffi.c b/moo/mod/ffi.c
index 38ccf57..a214376 100644
--- a/moo/mod/ffi.c
+++ b/moo/mod/ffi.c
@@ -59,6 +59,7 @@
 #define FMTC_LONGLONG 'L'
 #define FMTC_BCS 's'
 #define FMTC_UCS 'S'
+#define FMTC_BLOB 'b'
 #define FMTC_POINTER 'p'
 
 typedef struct link_t link_t;
@@ -419,9 +420,6 @@ static MOO_INLINE int add_ffi_arg (moo_t* moo, ffi_t* ffi, moo_ooch_t fmtc, int
 			break;
 		#endif
 
-#if 0
-		case 'B': /* byte array */
-#endif
 		case FMTC_BCS:
 		{
 			moo_bch_t* ptr;
@@ -472,6 +470,22 @@ static MOO_INLINE int add_ffi_arg (moo_t* moo, ffi_t* ffi, moo_ooch_t fmtc, int
 			break;
 		}
 
+		case FMTC_BLOB:
+		{
+			void* ptr;
+
+			if (MOO_OBJ_IS_BYTE_POINTER(arg)) goto inval_arg_value;
+			ptr = MOO_OBJ_GET_BYTE_SLOT(arg);
+
+		#if defined(USE_DYNCALL)
+			dcArgPointer (ffi->dc, ptr);
+		#elif defined(USE_LIBFFI)
+			ffi->arg_values[ffi->arg_count] = &ffi->arg_svs[ffi->arg_count].p;
+			ffi->arg_svs[ffi->arg_count].p = ptr;
+		#endif
+			break;
+		}
+
 		case FMTC_POINTER:
 		{
 			void* ptr;
@@ -570,6 +584,10 @@ static moo_pfrc_t pf_call (moo_t* moo, moo_mod_t* mod, moo_ooi_t nargs)
 	for (i = 0, j = 0, nfixedargs = 0; i < MOO_OBJ_GET_SIZE(sig); i++)
 	{
 		fmtc = MOO_OBJ_GET_CHAR_VAL(sig, i);
+		if (fmtc == ' ')
+		{
+			continue;
+		}
 		if (fmtc == '>') 
 		{
 			i++;
@@ -598,9 +616,9 @@ static moo_pfrc_t pf_call (moo_t* moo, moo_mod_t* mod, moo_ooi_t nargs)
 		j++;
 	}
 
+	while (i < MOO_OBJ_GET_SIZE(sig) && MOO_OBJ_GET_CHAR_VAL(sig, i) == ' '); /* skip all spaces after > */
 	fmtc = (i >= MOO_OBJ_GET_SIZE(sig)? FMTC_NULL: MOO_OBJ_GET_CHAR_VAL(sig, i));
 #if defined(USE_LIBFFI)
-/* TODO: handle unsigned */
 	fs = (nfixedargs == j)? ffi_prep_cif(&ffi->cif, FFI_DEFAULT_ABI, j, ffi->fmtc_to_type[0][fmtc], ffi->arg_types):
 	                        ffi_prep_cif_var(&ffi->cif, FFI_DEFAULT_ABI, nfixedargs, j, ffi->fmtc_to_type[0][fmtc], ffi->arg_types);
 	if (fs != FFI_OK)
@@ -617,6 +635,7 @@ static moo_pfrc_t pf_call (moo_t* moo, moo_mod_t* mod, moo_ooi_t nargs)
 	{
 /* TODO: support more types... */
 /* TODO: proper return value conversion */
+/* TODO: handle unsigned */
 		case FMTC_CHAR:
 		{
 		#if defined(USE_DYNCALL)
@@ -747,6 +766,17 @@ static moo_pfrc_t pf_call (moo_t* moo, moo_mod_t* mod, moo_ooi_t nargs)
 			break;
 		}
 
+
+#if 0
+		case FMTC_BLOB:
+		{
+			/* blob as a return type isn't sufficient as it lacks the size information. 
+			 * blob as an argument is just a pointer and the size can be yet another argument.
+			 * it there a good way to represent this here?... TODO: */
+			break;
+		}
+#endif
+
 		case FMTC_POINTER:
 		{
 			void* r;