This is fixed in 4.1.3-0.1 (in xenial and later), it now says:
Using an alphabetic character such as 'u' for the record separator is
highly likely to produce strange results. Using an unusual character
such as '/' is more likely to produce correct behavior in the majority
of cases, but there are no guarantees. The moral is: Know Your Data.
When using regular characters as the record separator, there is one
unusual case that occurs when 'gawk' is being fully POSIX-compliant
(*note Options::). Then, the following (extreme) pipeline prints a
surprising '1':
$ echo | gawk --posix 'BEGIN { RS = "a" } ; { print NF }'
-| 1
** Changed in: gawk-doc (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/287948
Title:
gawk-doc: example doesn't match actual output
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