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Date: Sun, 04 Feb 2018 14:59:30 -0800 (PST)
From: Steven Penny <svnpenn@gmail.com>
To: cygwin@cygwin.com
Subject: gawk: regression with unary plus
Content-Type: text/plain; charset=utf8; format=flowed
User-Agent: Tryst/2.3.0 (github.com/svnpenn/tryst)

Previously conversions could be triggered by either adding zero (+0), unary
plus (+) or unary minus (-) [1]:

    $ gawk --version
    GNU Awk 4.1.4, API: 1.1 (GNU MPFR 3.1.6-p1, GNU MP 6.1.2)

    $ ./gawk 'BEGIN {print "01" + 0}'
    1

    $ ./gawk 'BEGIN {print +"01"}'
    1

    $ ./gawk 'BEGIN {print -"01"}'
    -1

However now conversion only happens with adding zero and unary minus:

    $ gawk --version
    GNU Awk 4.2.0, API: 2.0 (GNU MPFR 3.1.6-p1, GNU MP 6.1.2)

    $ gawk 'BEGIN {print "01" + 0}'
    1

    $ gawk 'BEGIN {print +"01"}'
    01

    $ gawk 'BEGIN {print -"01"}'
    -1

Does anyone know where this change was mentioned or why it was done?

[1] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/awk.html


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