diff --git a/ChangeLog b/ChangeLog
index cf48c224a3..6d2df6929d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,14 @@
+Tue Sep  5 05:03:46 2006  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* numeric.c (fix_plus): addition in Fixnum will never overflow
+	  long.  a patch from Ondrej Bilka <neleai at seznam.cz>.
+	  [ruby-core:08794]
+
+	* numeric.c (fix_minus): ditto.
+
+	* bignum.c (rb_big_pow): eagerly truncate resulting bignum.
+	  [ruby-core:08794]
+
 Mon Sep  4 23:15:34 2006  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* time.c (time_to_s): make it conform to RFC2822 date format.
diff --git a/bignum.c b/bignum.c
index dd29124995..e3e8d80d9a 100644
--- a/bignum.c
+++ b/bignum.c
@@ -1553,8 +1553,10 @@ rb_big_pow(VALUE x, VALUE y)
 		while (yy % 2 == 0) {
 		    yy /= 2;
 		    x = rb_big_mul0(x, x);
+		    if (!BDIGITS(x)[RBIGNUM(x)->len-1]) RBIGNUM(x)->len--;
 		}
 		z = rb_big_mul0(z, x);
+		if (!BDIGITS(z)[RBIGNUM(z)->len-1]) RBIGNUM(z)->len--;
 	    }
 	    return bignorm(z);
 	}
diff --git a/numeric.c b/numeric.c
index 5a08f0637b..d5829d14a3 100644
--- a/numeric.c
+++ b/numeric.c
@@ -1908,11 +1908,8 @@ fix_plus(VALUE x, VALUE y)
 	a = FIX2LONG(x);
 	b = FIX2LONG(y);
 	c = a + b;
-	r = LONG2FIX(c);
+	r = LONG2NUM(c);
 
-	if (FIX2LONG(r) != c) {
-	    r = rb_big_plus(rb_int2big(a), rb_int2big(b));
-	}
 	return r;
     }
     switch (TYPE(y)) {
@@ -1944,11 +1941,8 @@ fix_minus(VALUE x, VALUE y)
 	a = FIX2LONG(x);
 	b = FIX2LONG(y);
 	c = a - b;
-	r = LONG2FIX(c);
+	r = LONG2NUM(c);
 
-	if (FIX2LONG(r) != c) {
-	    r = rb_big_minus(rb_int2big(a), rb_int2big(b));
-	}
 	return r;
     }
     switch (TYPE(y)) {