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pc(1): _ handling in numbers was broken at some point; restore documented behaviour

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

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

@@ -527,7 +527,7 @@

 	if(c == '\n') prompted = 0;

 	if(isdigit(c)){

 		for(p = buf, *p++ = c; c = Bgetc(in), isalnum(c) || c == '_'; )

-			if(p < buf + sizeof(buf) - 1)

+			if(p < buf + sizeof(buf) - 1 && c != '_')

 				*p++ = c;

 		*p = 0;

 		Bungetc(in);