help whos incorrect

[Michael D Godfrey]

I noticed Attr flags in a whos command that are not in the help whos
documentation.  Since whos is builtin I do not know where the documentation
is kept.  here are the facts:
help whos says (in part)
    Attr
          Attributes of the listed variable.  Possible attributes are:
         blank
               Variable in local scope

         `g'
               Variable with global scope

         `p'
               Persistent variable
==========================================
But, in src/variables.cc it says:

                    tmp[0] = (is_automatic ? 'a' : ' ');
                    tmp[1] = (is_formal ? 'f' : ' ');
                    tmp[2] = (is_global ? 'g' : ' ');
                    tmp[3] = (is_persistent ? 'p' : ' ');
==============================
These are the flags that may be printed.

If I knew where to apply the patch I would do it, but someone who
knows could do the same in a few minutes.

In my case I got an 'f' flag and wondered what it meant.

Michael