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u8_escape: 11 bytes extra is not enough

--- a/src/utf8.c

+++ b/src/utf8.c

@@ -162,11 +162,11 @@

 	usize i = *pi, i0;

 	Rune ch;

 	char *start = buf;

-	char *blim = start + sz-11;

-	assert(sz > 11);

+	char *blim = start + sz-12;

+	assert(sz > 12);

 	while(i < end && buf < blim){

-		// sz-11: leaves room for longest escape sequence

+		// sz-12: leaves room for longest escape sequence

 		if(escape_quotes && src[i] == '"'){

 			buf += buf_put2c(buf, "\\\"");

 			i++;