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mptrunc: normalize after mpassign to handle the case b==r

--- a/sys/src/libmp/port/mplogic.c

+++ b/sys/src/libmp/port/mplogic.c

@@ -153,6 +153,7 @@

 	}else if(b->sign == 1){

 		if(d >= b->top){

 			mpassign(b, r);

+			mpnorm(r);

 			return;

 		}

 		if(b != r)

-- 

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