From @masak

<masak> r​: say { 0 => 1, 1 => 0 }.max(​:by(*.value))
<p6eval> rakudo a41a48​: OUTPUT«"1" => 0␤»
<masak> looks like a bug to me.
* masak submits rakudobug
<masak> grondilu++ # discoverer
<moritz> r​: say { 0 => 1, 1 => 0 }.pairs.max(​:by(*.value))
<p6eval> rakudo a41a48​: OUTPUT«"1" => 0␤»
<moritz> r​: say (0 => 1, 1 => 0).max(​:by(*.value))
<p6eval> rakudo a41a48​: OUTPUT«1 => 0␤»
<masak> r​: say max :by(*.value), { 0 => 1, 1 => 0 }.list
<p6eval> rakudo a41a48​: OUTPUT«"0" => 1␤»
<masak> I think a number of method forms may simply be missing their
:by parameter.
<moritz> r​: say List.can('max')
<p6eval> rakudo a41a48​: OUTPUT«max␤»
<moritz> r​: say List.can('max')[0].signature.perl
<p6eval> rakudo a41a48​: OUTPUT«​:(​: $by = { ... }, Mu *%_)␤»
<moritz> r​: say Parcel.can('max')[0].signature.perl
<p6eval> rakudo a41a48​: OUTPUT«​:(​: $by = { ... }, Mu *%_)␤»
<moritz> seems it should work
<masak> weird.

From @MasterDuke17

On Fri Nov 16 03​:25​:43 2012, masak wrote​:

<masak> r​: say { 0 => 1, 1 => 0 }.max(​:by(*.value))
<p6eval> rakudo a41a48​: OUTPUT«"1" => 0␤»
<masak> looks like a bug to me.
* masak submits rakudobug
<masak> grondilu++ # discoverer
<moritz> r​: say { 0 => 1, 1 => 0 }.pairs.max(​:by(*.value))
<p6eval> rakudo a41a48​: OUTPUT«"1" => 0␤»
<moritz> r​: say (0 => 1, 1 => 0).max(​:by(*.value))
<p6eval> rakudo a41a48​: OUTPUT«1 => 0␤»
<masak> r​: say max :by(*.value), { 0 => 1, 1 => 0 }.list
<p6eval> rakudo a41a48​: OUTPUT«"0" => 1␤»
<masak> I think a number of method forms may simply be missing their
:by parameter.
<moritz> r​: say List.can('max')
<p6eval> rakudo a41a48​: OUTPUT«max␤»
<moritz> r​: say List.can('max')[0].signature.perl
<p6eval> rakudo a41a48​: OUTPUT«​:(​: $by = { ... }, Mu *%_)␤»
<moritz> r​: say Parcel.can('max')[0].signature.perl
<p6eval> rakudo a41a48​: OUTPUT«​:(​: $by = { ... }, Mu *%_)␤»
<moritz> seems it should work
<masak> weird.

Some notes from today​:

18​:18 MasterDuke r​: say (0 => 1, 1 => 0).max(​:by(*.value))
18​:18 camelia rakudo-moar 68443f, rakudo-jvm cd19db​: OUTPUT«1 => 0␤»
18​:18 MasterDuke r​: say (0 => 1, 1 => 0).max(*.value)
18​:18 camelia rakudo-moar 68443f, rakudo-jvm cd19db​: OUTPUT«0 => 1␤»
18​:20 MasterDuke r​: say List.can("max")[0].signature.perl
18​:20 camelia rakudo-moar 68443f, rakudo-jvm cd19db​: OUTPUT«​:($​: | is raw)␤»
18​:20 MasterDuke i was looking at RT #​115758, but it's pretty old
18​:20 synopsebot6 Link​: https://rt-archive.perl.org/perl6//Publ​ic/Bug/Display.html?id=115758
18​:21 MasterDuke r​: say max :by(*.value), { 0 => 1, 1 => 0 }
18​:21 camelia rakudo-moar 68443f, rakudo-jvm cd19db​: OUTPUT«0 => 1␤»

19​:55 MasterDuke masak, moritz​: do you think RT #​115758 is still valid?

20​:14 masak MasterDuke​: yes, I think it's still valid. unless something has happened that's outside of the scope of what I'm reading in that ticket. but I know of no such thing.

From @MasterDuke17

On Tue Aug 30 20​:00​:31 2016, ddgreen@​gmail.com wrote​:

On Fri Nov 16 03​:25​:43 2012, masak wrote​:

<masak> r​: say { 0 => 1, 1 => 0 }.max(​:by(*.value))
<p6eval> rakudo a41a48​: OUTPUT«"1" => 0␤»
<masak> looks like a bug to me.
* masak submits rakudobug
<masak> grondilu++ # discoverer
<moritz> r​: say { 0 => 1, 1 => 0 }.pairs.max(​:by(*.value))
<p6eval> rakudo a41a48​: OUTPUT«"1" => 0␤»
<moritz> r​: say (0 => 1, 1 => 0).max(​:by(*.value))
<p6eval> rakudo a41a48​: OUTPUT«1 => 0␤»
<masak> r​: say max :by(*.value), { 0 => 1, 1 => 0 }.list
<p6eval> rakudo a41a48​: OUTPUT«"0" => 1␤»
<masak> I think a number of method forms may simply be missing their
:by parameter.
<moritz> r​: say List.can('max')
<p6eval> rakudo a41a48​: OUTPUT«max␤»
<moritz> r​: say List.can('max')[0].signature.perl
<p6eval> rakudo a41a48​: OUTPUT«​:(​: $by = { ... }, Mu *%_)␤»
<moritz> r​: say Parcel.can('max')[0].signature.perl
<p6eval> rakudo a41a48​: OUTPUT«​:(​: $by = { ... }, Mu *%_)␤»
<moritz> seems it should work
<masak> weird.

Some notes from today​:

18​:18 MasterDuke r​: say (0 => 1, 1 => 0).max(​:by(*.value))
18​:18 camelia rakudo-moar 68443f, rakudo-jvm cd19db​:
OUTPUT«1 => 0␤»
18​:18 MasterDuke r​: say (0 => 1, 1 => 0).max(*.value)
18​:18 camelia rakudo-moar 68443f, rakudo-jvm cd19db​:
OUTPUT«0 => 1␤»
18​:20 MasterDuke r​: say List.can("max")[0].signature.perl
18​:20 camelia rakudo-moar 68443f, rakudo-jvm cd19db​:
OUTPUT«​:($​: | is raw)␤»
18​:20 MasterDuke i was looking at RT #​115758, but it's pretty
old
18​:20 synopsebot6 Link​: https://rt-archive.perl.org/perl6//Publ
ic/Bug/Display.html?id=115758
18​:21 MasterDuke r​: say max :by(*.value), { 0 => 1, 1 => 0 }
18​:21 camelia rakudo-moar 68443f, rakudo-jvm cd19db​:
OUTPUT«0 => 1␤»

19​:55 MasterDuke masak, moritz​: do you think RT #​115758 is
still valid?

20​:14 masak MasterDuke​: yes, I think it's still valid. unless
something has happened that's outside of the scope of what I'm reading
in that ticket. but I know of no such thing.

Commentary from jnthn​: http://irclog.perlgeek.de/perl6-dev/2016-08-31#i_13127809

Some of the most relevant portions quoted below.

<jnthn> I'm curious if any other non-max methods take :by though. I'd thought we were doing that on the sub forms to not confuse the transform with a list value
<jnthn> But on the method forms there's no such ambiguity
<MasterDuke> git grep 'method.*​:by' (or git grep 'method.*​:&by')
<MasterDuke> returns no results
<jnthn> Suggests "no" then :)
<jnthn> In which case the ticket is kinda asking us to add them *everywhere* since it'd be odd to do it just for max. :)
<jnthn> But I'm not really that inclined to.
<jnthn> Yeah, so far as I recall we went that way on the subs, and positional for the methods, and it was a deliberate choice

Based on the above conversation I'm going to recommend this be closed as not a bug.

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