I was going to just edit my post after I got my perlbrew available issue sorted (which I did), but this warrants a new post.
In 5.10, it produces the result aa that is expected by OP:
spek@scelia ~/scratch $ perlbrew exec perl -le '@_ = qw( a b c ); @A =
+ ( shift @_ )[ 0, 0 ]; print @A'
perl-5.27.10
==========
aa
perl-5.26.1
==========
aa
perl-5.20.0
==========
aa
perl-5.18.4
==========
a
perl-5.10.1
==========
aa
Going full out, and am installing as many versions as I can to see where it "broke", where it "fixed" and where it "broke" again. Help desired.
Update: To further, on Unix, it "works" up to 5.12.5, from my testing so far, then goes awry:
spek@scelia ~/scratch $ perlbrew exec perl -le '@_ = qw( a b c ); @A =
+ ( shift @_ )[ 0, 0 ]; print @A'
perl-5.27.10
==========
aa
perl-5.26.1
==========
aa
perl-5.20.0
==========
aa
perl-5.18.4
==========
a
perl-5.16.0
==========
a
perl-5.14.4
==========
a
perl-5.12.5
==========
aa
perl-5.10.1
==========
aa
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