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units: accept negative numbers

--- a/sys/src/cmd/units.y

+++ b/sys/src/cmd/units.y

@@ -225,7 +225,7 @@

 	peekrune = ' ';

 loop:

-	if((c >= '0' && c <= '9') || c == '.')

+	if((c >= '0' && c <= '9') || c == '.' || c == '-' || c == '+')

 		goto numb;

 	if(ralpha(c))

 		goto alpha;

-- 

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