pkill and pgrep: reality check

While investigating some odd behavior of pkill(1), I discovered
that pkill and pgrep match any name that has the argument as a
substring.

    pgrep e

	outputs a long list of pid's.

    pgrep ""

	outputs all pid's.

I tried pgrep on the oldest distribution I had still running,
Slackware-11.0 (according to Wikipedia, released 2006-10-02).
The result was the same.  It seems too old to be a bug; but
the man page is buggy for not giving a big fat WARNING.
Or am I the only user of pkill?
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