From @zoffixznet

zoffix@​VirtualBox​:~$ perl6 -e 'my int $x = 4; say $x || 2'
1
zoffix@​VirtualBox​:~$ perl6 --optimize=off -e 'my int $x = 4; say $x || 2'
4
zoffix@​VirtualBox​:~$ perl6 -v
This is Rakudo version 2016.11-182-gea28845 built on MoarVM version 2016.11-41-gd2139b5
implementing Perl 6.c.
zoffix@​VirtualBox​:~$

There's a pretty good chance that the optimizer evaluates the statement and encounters NQP bug involving ||​: Raku/nqp#332

From @dogbert17

On Sun, 25 Dec 2016 09​:50​:17 -0800, cpan@​zoffix.com wrote​:

zoffix@​VirtualBox​:~$ perl6 -e 'my int $x = 4; say $x || 2'
1
zoffix@​VirtualBox​:~$ perl6 --optimize=off -e 'my int $x = 4; say $x ||
2'
4
zoffix@​VirtualBox​:~$ perl6 -v
This is Rakudo version 2016.11-182-gea28845 built on MoarVM version
2016.11-41-gd2139b5
implementing Perl 6.c.
zoffix@​VirtualBox​:~$

There's a pretty good chance that the optimizer evaluates the
statement and encounters NQP bug involving ||​:
Raku/nqp#332

Looks as if Zoffix fixed this with rakudo/rakudo@83e1570

The RT System itself - Status changed from 'new' to 'open'

From @zoffixznet

Tests in Raku/roast@b1f116f

@zoffixznet - Status changed from 'open' to 'resolved'