Update: But we aren't using "+<" nor "+>" so that section doesn't apply either.
Actually it is not documented (so I was incorrect in another post that it is "perfectly" documented), but it applies. Indeed I found out that it even works with a '<' mode. See my own I've been bit in the neck by open().

In reply to Re^3: 3-arg open() does not give warnings!? (3 != 1) by blazar
in thread 3-arg open() does not give warnings!? by graff

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