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handle NaN in awk (thanks spew)

--- a/sys/src/cmd/awk/lib.c

+++ b/sys/src/cmd/awk/lib.c

@@ -696,7 +696,7 @@

 	}

 	r = strtod(s, &ep);

-	if (ep == s || isInf(r, 1) || isInf(r, -1))

+	if (ep == s || isInf(r, 1) || isInf(r, -1) || isNaN(r))

 		return 0;

 	while (*ep == ' ' || *ep == '\t' || *ep == '\n')

 		ep++;

-- 

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