In help declare it says:
Using `+' instead of `-' turns off the given attribute.
In the Bash man page it says:
Using `+' instead of `-' turns off the attribute instead, with the
exceptions that +a and +A may not be used to destroy array variables and
+r will not remove the readonly attribute.
The help text needs to be updated to reflect this limitation. Something
like:
Using `+' instead of `-' turns off the given attribute except for a, A
and r.
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