Re: [Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-21 Thread Jakov Sosic

On 10/16/2012 04:34 PM, jcbollinger wrote:

Here's one solution: keep parametrized classes themselves, but deprecate
and eventually remove the parametrized-class declaration syntax.  That
would leave class parameters as formalized declarations of external data
used by classes, while removing the possibility of inconsistent class
declarations.  It would also pull back from the confusing effort to make
classes appear to be resources when in fact they are not (for example,
create_resources() won't create classes).


I really like this solution.

Great post jcbollinger - as always. Really enjoy reading your opinions 
and solutions.




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www.srce.unizg.hr

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Re: [Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-16 Thread R.I.Pienaar


- Original Message -
 From: jcbollinger john.bollin...@stjude.org
 To: puppet-users@googlegroups.com
 Sent: Monday, October 15, 2012 9:45:12 PM
 Subject: Re: [Puppet Users] Re: Puppet 3.0.0 and Hiera
 
 

snip

 
 Indeed, I personally look at it quite the other way around: hiera
 integration makes parametrized classes tolerable.  It provides a good

I agree, tolerable is the right word here, was not suggesting the
integration now makes them totally usable.

however with a simple consistent approach and style in your own modules
you can work around some of the remaining issues.  We knew dynamic
scoping sucked yet most of us have come up with a way to write our
modules so we don't get bit by those issues by adopting a few simple
rules and avoid some of the more problematic areas.

Applying the same approach to param classes did at least get me to a
place that I feel was better off than the older method - but yes, its a
shame we even have to come up with a style for working around problems
in something as key as class paramaterization.

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[Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-16 Thread jcbollinger


On Monday, October 15, 2012 4:32:28 PM UTC-5, Ellison Marks wrote:

 I don't intend to use parametrized declarations(Right now I'm simply using 
 hiera_include in the default node for everything and loving it). I do 
 however, very much like the convenience of the new syntax. In addition, my 
 use case for default values in the puppet backend that shipped with the 
 class wasn't terribly complex, so simply including a default value in the 
 class itself serves my needs well.

 In my case, the new features are simply a more convenient way of doing 
 what i was already doing(sans the array and hash functionality).


I don't see it, but that's a question of style and personal preference.  
Other than the effort required to get from here to there, there is nothing 
inherently negative about your plan as you describe it.  Please don't take 
my comments as personal criticism.

I truly am interested in whether there are advantages to class 
parametrization that may not be evident to me, but I used your comments 
mostly as a springboard for the discussion that now ensues.  Regulars 
around here know that I am a longtime critic of Puppet's parametrized class 
design.  It is better in Puppet 3 -- a lot better, in fact -- but there are 
still some significant issues.  I consider it a community service to 
publicize those issues, both to help people avoid tripping over them and to 
keep PL's feet to the fire.


John

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Re: [Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-16 Thread jcbollinger


On Monday, October 15, 2012 6:59:45 PM UTC-5, Nick Fagerlund wrote:



 On Monday, October 15, 2012 1:45:12 PM UTC-7, jcbollinger wrote:


 Indeed, I have taken a second look, and a third, and maybe more.  I love 
 the hiera integration with parametrized classes.  It was a fabulous idea, 
 as it makes it reasonable and safe to use existing parametrized classes 
 (provided you use only 'include' or 'require' to declare them).

 Even with that, however, parametrized classes offer very little of value 
 over non-parametrized analogs that implement the same hiera-based external 
 data access.  One could argue, perhaps, that there is a documentary 
 advantage in parametrization, but I think that's poor justification for 
 introducing functional (so to speak) elements to any class.  That's what 
 comments are for.


 But parameters expose that info to more than humans -- for example, you 
 can use the resource_type REST endpoint today to get a list of all classes 
 and their parameters and defaults. Not a lot is using that today, but I 
 expect more and more things to start doing auto-discovery of parameters, 
 since it's a really machine-friendly way to find out what a class wants.



That's an interesting angle of which I was not aware.  I'm not sure I see a 
use case beyond automatic documentation generation, however, and there are 
alternative approaches that could serve that particular purpose.  Do you 
envision other specific uses?

Also, have you considered that any explicit hiera lookups in the class body 
also represent machine-discoverable things that a class wants?  So long 
as there is no plan to deprecate the hiera functions, any approach to 
identifying classes' data dependencies that does not account for explicit 
lookups is incomplete.


John

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Re: [Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-16 Thread R.I.Pienaar


- Original Message -
 From: jcbollinger john.bollin...@stjude.org
 To: puppet-users@googlegroups.com
 Sent: Tuesday, October 16, 2012 3:11:55 PM
 Subject: Re: [Puppet Users] Re: Puppet 3.0.0 and Hiera

snip

 But parameters expose that info to more than humans -- for example,
 you can use the resource_type REST endpoint today to get a list of
 all classes and their parameters and defaults. Not a lot is using
 that today, but I expect more and more things to start doing
 auto-discovery of parameters, since it's a really machine-friendly
 way to find out what a class wants.
 
 
 That's an interesting angle of which I was not aware. I'm not sure I
 see a use case beyond automatic documentation generation, however,
 and there are alternative approaches that could serve that
 particular purpose. Do you envision other specific uses?

web interfaces that prompts for the right info when someone adds a class
to a machine.


It would be great if you can set your email client to send plain text
emails as per list guidelines.

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Re: [Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-16 Thread jcbollinger


On Tuesday, October 16, 2012 3:23:14 AM UTC-5, R.I. Pienaar wrote:

 its a 
 shame we even have to come up with a style for working around problems 
 in something as key as class paramaterization. 



I think it's a shame that prevailing opinion holds class parametrization to 
be a key feature.  There continue to be problems with it largely because it 
is conceptually inconsistent with Puppet's model for classes (specifically, 
with their singleton nature).  Because Puppet cannot accept inconsistent 
declarations of a class, Puppet DSL should not facilitate users writing 
such declarations into their manifests.  Indeed, isn't that much the same 
logic PL used in deciding to remove dynamic scoping?

Here's one solution: keep parametrized classes themselves, but deprecate 
and eventually remove the parametrized-class declaration syntax.  That 
would leave class parameters as formalized declarations of external data 
used by classes, while removing the possibility of inconsistent class 
declarations.  It would also pull back from the confusing effort to make 
classes appear to be resources when in fact they are not (for example, 
create_resources() won't create classes).


John

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Re: [Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-16 Thread jcbollinger

On Tuesday, October 16, 2012 9:16:43 AM UTC-5, R.I. Pienaar wrote:

 It would be great if you can set your email client to send plain text 
 emails as per list guidelines. 


If I were using an e-mail client then I would be happy to do so, but I'm 
posting via Google's web interface.

John

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[Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-16 Thread Ellison Marks
No worries. I'm enjoying the discussion.

On Tuesday, October 16, 2012 7:01:47 AM UTC-7, jcbollinger wrote:



 On Monday, October 15, 2012 4:32:28 PM UTC-5, Ellison Marks wrote:

 I don't intend to use parametrized declarations(Right now I'm simply 
 using hiera_include in the default node for everything and loving it). I do 
 however, very much like the convenience of the new syntax. In addition, my 
 use case for default values in the puppet backend that shipped with the 
 class wasn't terribly complex, so simply including a default value in the 
 class itself serves my needs well.

 In my case, the new features are simply a more convenient way of doing 
 what i was already doing(sans the array and hash functionality).


 I don't see it, but that's a question of style and personal preference.  
 Other than the effort required to get from here to there, there is nothing 
 inherently negative about your plan as you describe it.  Please don't take 
 my comments as personal criticism.

 I truly am interested in whether there are advantages to class 
 parametrization that may not be evident to me, but I used your comments 
 mostly as a springboard for the discussion that now ensues.  Regulars 
 around here know that I am a longtime critic of Puppet's parametrized class 
 design.  It is better in Puppet 3 -- a lot better, in fact -- but there are 
 still some significant issues.  I consider it a community service to 
 publicize those issues, both to help people avoid tripping over them and to 
 keep PL's feet to the fire.


 John



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[Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-15 Thread jcbollinger


On Friday, October 12, 2012 12:10:38 PM UTC-5, Ellison Marks wrote:

 Not to let this thread go to waste...

 Since I'm now trying to move away from the hiera functions themselves to 
 the parameter style



Why?  The ability to achieve separation of data from code while avoiding 
parametrized classes is one of the greatest advantages conferred by hiera.  
Every parametrized-style class declaration (not definition) in your 
manifests is a bug waiting to happen.  And if you're not going to use such 
declarations, then why do you want to spend effort on converting your 
classes to make it possible?


John

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Re: [Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-15 Thread R.I.Pienaar


- Original Message -
 From: jcbollinger john.bollin...@stjude.org
 To: puppet-users@googlegroups.com
 Sent: Monday, October 15, 2012 3:35:30 PM
 Subject: [Puppet Users] Re: Puppet 3.0.0 and Hiera
 
 
 
 On Friday, October 12, 2012 12:10:38 PM UTC-5, Ellison Marks wrote:
 
 Not to let this thread go to waste...
 
 Since I'm now trying to move away from the hiera functions themselves
 to the parameter style
 
 
 Why? The ability to achieve separation of data from code while
 avoiding parametrized classes is one of the greatest advantages
 conferred by hiera. Every parametrized-style class declaration (not
 definition) in your manifests is a bug waiting to happen. And if
 you're not going to use such declarations, then why do you want to
 spend effort on converting your classes to make it possible?
 
 

the param classes integration with hiera in puppet 3 does make it
worth taking another look at param classes:

The code:

  class x($y=hello) {
notify{$y: }
  }

  include x
  include x


actually works fine, note this is basically your old school puppet
syntax, multiple calls to include etc, but with hiera integration
for the variable key x::y.

this deals with the dynamic scoping problem, deals with most of the
things I hate(d) about param classes and gives me magical abilities
to do overrides where and how I need them.

You can still if u wish use the new param classes style of including,
ENC etc can all supply data just like always.

from a code share perspective this is a big win, simply using param 
classes means your module is forwards and backwards compatible with
hiera or without hiera.

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Re: [Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-15 Thread jcbollinger


On Monday, October 15, 2012 9:49:38 AM UTC-5, R.I. Pienaar wrote:



 - Original Message - 
  From: jcbollinger
  To: puppet...@googlegroups.com javascript: 
  Sent: Monday, October 15, 2012 3:35:30 PM 
  Subject: [Puppet Users] Re: Puppet 3.0.0 and Hiera 
  
  
  
  On Friday, October 12, 2012 12:10:38 PM UTC-5, Ellison Marks wrote: 
  
  Not to let this thread go to waste... 
  
  Since I'm now trying to move away from the hiera functions themselves 
  to the parameter style 
  
  
  Why? The ability to achieve separation of data from code while 
  avoiding parametrized classes is one of the greatest advantages 
  conferred by hiera. Every parametrized-style class declaration (not 
  definition) in your manifests is a bug waiting to happen. And if 
  you're not going to use such declarations, then why do you want to 
  spend effort on converting your classes to make it possible? 
  
  

 the param classes integration with hiera in puppet 3 does make it 
 worth taking another look at param classes: 



Indeed, I have taken a second look, and a third, and maybe more.  I love 
the hiera integration with parametrized classes.  It was a fabulous idea, 
as it makes it reasonable and safe to use existing parametrized classes 
(provided you use only 'include' or 'require' to declare them).

Even with that, however, parametrized classes offer very little of value 
over non-parametrized analogs that implement the same hiera-based external 
data access.  One could argue, perhaps, that there is a documentary 
advantage in parametrization, but I think that's poor justification for 
introducing functional (so to speak) elements to any class.  That's what 
comments are for.

 


 The code: 

   class x($y=hello) { 
 notify{$y: } 
   } 

   include x 
   include x 


 actually works fine, note this is basically your old school puppet 
 syntax, multiple calls to include etc, but with hiera integration 
 for the variable key x::y. 



Yes, that's great.  The problem is that

include x
class { 'x': y = 'goodbye' }

blows up.  On the other hand, I understand that

class { 'x': y = 'goodbye' }
include x

works again, which may be even worse (poor consistency).

Of course in that simple example you can just remove either duplicate 
declaration, but in real-world examples those declarations are likely to be 
in different classes, maybe in different modules.  Even if the problem is 
known to the site maintainer, it's not necessarily easy to ensure that 
those declarations are parsed in an order that will work.

The problem is not the parametrized classes themselves, and certainly not 
the hiera integration, but rather the parametrized-style declarations.  
Indeed, it was true at least in 2.7 that parametrized-style declarations 
could cause you trouble for non-parametrized classes:

class z {
  notify { 'z': }
}

class { 'z': }
include 'z'  # kapow!


As far as I have been able to determine -- and I've been looking -- Puppet 
3 carries over 2.7's biggest problems attending parametrized class 
declarations.  It's easy enough in Puppet 3 to just avoid using 
parametrized-style declarations (yay!), but if you're going to avoid using 
them then where's the value in modifying existing classes to support using 
them?
 


 this deals with the dynamic scoping problem, deals with most of the 
 things I hate(d) about param classes and gives me magical abilities 
 to do overrides where and how I need them.



The alternative I would recommend to anyone is this:

class x {
  $y = hiera('y', 'hello')
  notify{$y: } 
}

coupled with avoiding parametrized-style class declarations.  It solves the 
dynamic scoping problem exactly as well as does the parametrized version 
does.  It is slightly more verbose than the parametrized version, but more 
explicit about what's happening.

That's what I gathered the OP's classes looked like to begin with, since he 
said he was using the hiera functions.  So I ask again, given classes 
structured similar to that, why would it be worth the investment in time 
and effort to convert them to parametrized classes?

 


 You can still if u wish use the new param classes style of including, 
 ENC etc can all supply data just like always. 

 from a code share perspective this is a big win, simply using param 
 classes means your module is forwards and backwards compatible with 
 hiera or without hiera. 



Ok, so there's at least one fair consideration.  If you are looking to 
write classes that are backwards-compatible with Puppet 2.[67] setups not 
augmented with hiera, then parametrized classes are a way to do it.  They 
may even be the best way.  I don't think you do users any favors by doing 
so, however; I would prefer to just make my modules depend on hiera, and 
let that be a threshold issue for 2.x sites.

Indeed, I personally look at it quite the other way around: hiera 
integration makes parametrized classes tolerable.  It provides a good way 
forward for the many people who wrote and now

[Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-15 Thread Ellison Marks
On Monday, October 15, 2012 7:35:30 AM UTC-7, jcbollinger wrote:



 On Friday, October 12, 2012 12:10:38 PM UTC-5, Ellison Marks wrote:

 Not to let this thread go to waste...

 Since I'm now trying to move away from the hiera functions themselves to 
 the parameter style



 Why?  The ability to achieve separation of data from code while avoiding 
 parametrized classes is one of the greatest advantages conferred by hiera.  
 Every parametrized-style class declaration (not definition) in your 
 manifests is a bug waiting to happen.  And if you're not going to use such 
 declarations, then why do you want to spend effort on converting your 
 classes to make it possible?


 John


Er, perhaps I wasn't being clear, which is entirely possible.

I don't intend to use parametrized declarations(Right now I'm simply using 
hiera_include in the default node for everything and loving it). I do 
however, very much like the convenience of the new syntax. In addition, my 
use case for default values in the puppet backend that shipped with the 
class wasn't terribly complex, so simply including a default value in the 
class itself serves my needs well.

In my case, the new features are simply a more convenient way of doing what 
i was already doing(sans the array and hash functionality).

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Re: [Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-15 Thread Nick Fagerlund


On Monday, October 15, 2012 1:45:12 PM UTC-7, jcbollinger wrote:


 Indeed, I have taken a second look, and a third, and maybe more.  I love 
 the hiera integration with parametrized classes.  It was a fabulous idea, 
 as it makes it reasonable and safe to use existing parametrized classes 
 (provided you use only 'include' or 'require' to declare them).

 Even with that, however, parametrized classes offer very little of value 
 over non-parametrized analogs that implement the same hiera-based external 
 data access.  One could argue, perhaps, that there is a documentary 
 advantage in parametrization, but I think that's poor justification for 
 introducing functional (so to speak) elements to any class.  That's what 
 comments are for.


But parameters expose that info to more than humans -- for example, you can 
use the resource_type REST endpoint today to get a list of all classes and 
their parameters and defaults. Not a lot is using that today, but I expect 
more and more things to start doing auto-discovery of parameters, since 
it's a really machine-friendly way to find out what a class wants.

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[Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-12 Thread Ellison Marks
Not to let this thread go to waste...

Since I'm now trying to move away from the hiera functions themselves to 
the parameter style, is there a way I can specify that the lookup should be 
additive, hiera_hash or hiera_array style? If not, is that a planned 
feature?

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Re: [Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-12 Thread R.I.Pienaar


- Original Message -
 From: Ellison Marks gty...@gmail.com
 To: puppet-users@googlegroups.com
 Sent: Friday, October 12, 2012 6:10:38 PM
 Subject: [Puppet Users] Re: Puppet 3.0.0 and Hiera
 
 Not to let this thread go to waste...
 
 Since I'm now trying to move away from the hiera functions themselves
 to the parameter style, is there a way I can specify that the lookup
 should be additive, hiera_hash or hiera_array style? If not, is that
 a planned feature?


unfortunately not

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Re: [Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-07 Thread Stefan Goethals
Sorry to burst you bubble
The puppet backend has been 'broken' (intentionally?)

- https://projects.puppetlabs.com/issues/16321
-
https://mail.google.com/mail/u/1/?ui=2shva=1#search/label%3Apuppet-users+pienaar/13a168982ad38854

Lots needs fixing...

Zipkid (Stefan)


On Fri, Oct 5, 2012 at 10:43 PM, Ellison Marks gty...@gmail.com wrote:

 Thanks for the reply. I'll probably start migrating things to the new
 parameter based lookup and a disk based hierarchy anyway, but it's good
 to know that my setup probably won't break immediately upon upgrading. ^_^


 On Friday, October 5, 2012 12:44:41 PM UTC-7, Nick Fagerlund wrote:



 On Friday, October 5, 2012 10:47:58 AM UTC-7, Ellison Marks wrote:

 I've been using Hiera and Hiera-Puppet with Puppet 2.7 for a while now,
 and I've been quite enjoying it. I just noticed the available update for
 Puppet and saw that Hiera was now part of core Puppet. However, I've been
 unable to parse exactly what parts made it over...


 Yeah sorry, I'm working on clarifying that today.  The answer is: ALL OF
 IT, but you might have to move your config file or change a setting.

 - Puppet has a hiera_config setting that defaults to $confdir/hiera.yaml.
 It won't fall back to hiera's default conf file. If your conf is at
 /etc/hiera.yaml, move it or tell puppet.conf where it is.
 http://docs.puppetlabs.com/**references/latest/**
 configuration.html#hieraconfighttp://docs.puppetlabs.com/references/latest/configuration.html#hieraconfig
 - The hierarchy itself works the same, including fact interpolation.
 - All four hiera functions are still there. No need to change their names.
 - The puppet backend is still there! That's one that we were planning
 to remove at one point, and I don't yet have the whole story on how that
 went down, but it did stay in. Or at least, it's in the source code; I
 don't know how packages and gems deal with it, yet.
 - The generic lookup function didn't happen. The built-in
 data_binding code currently only applies to class parameters; we left an
 expansion of it for a later date, once we have a deeper understanding of
 users' needs and challenges.

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[Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-05 Thread Nick Fagerlund


On Friday, October 5, 2012 10:47:58 AM UTC-7, Ellison Marks wrote:

 I've been using Hiera and Hiera-Puppet with Puppet 2.7 for a while now, 
 and I've been quite enjoying it. I just noticed the available update for 
 Puppet and saw that Hiera was now part of core Puppet. However, I've been 
 unable to parse exactly what parts made it over...


Yeah sorry, I'm working on clarifying that today.  The answer is: ALL OF 
IT, but you might have to move your config file or change a setting. 

- Puppet has a hiera_config setting that defaults to $confdir/hiera.yaml. 
It won't fall back to hiera's default conf file. If your conf is at 
/etc/hiera.yaml, move it or tell puppet.conf where it is. 
http://docs.puppetlabs.com/references/latest/configuration.html#hieraconfig
- The hierarchy itself works the same, including fact interpolation. 
- All four hiera functions are still there. No need to change their names.
- The puppet backend is still there! That's one that we were planning to 
remove at one point, and I don't yet have the whole story on how that went 
down, but it did stay in. Or at least, it's in the source code; I don't 
know how packages and gems deal with it, yet. 
- The generic lookup function didn't happen. The built-in data_binding 
code currently only applies to class parameters; we left an expansion of it 
for a later date, once we have a deeper understanding of users' needs and 
challenges.

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[Puppet Users] Re: Puppet 3.0.0 and Hiera

2012-10-05 Thread Ellison Marks
Thanks for the reply. I'll probably start migrating things to the new 
parameter based lookup and a disk based hierarchy anyway, but it's good 
to know that my setup probably won't break immediately upon upgrading. ^_^

On Friday, October 5, 2012 12:44:41 PM UTC-7, Nick Fagerlund wrote:



 On Friday, October 5, 2012 10:47:58 AM UTC-7, Ellison Marks wrote:

 I've been using Hiera and Hiera-Puppet with Puppet 2.7 for a while now, 
 and I've been quite enjoying it. I just noticed the available update for 
 Puppet and saw that Hiera was now part of core Puppet. However, I've been 
 unable to parse exactly what parts made it over...


 Yeah sorry, I'm working on clarifying that today.  The answer is: ALL OF 
 IT, but you might have to move your config file or change a setting. 

 - Puppet has a hiera_config setting that defaults to $confdir/hiera.yaml. 
 It won't fall back to hiera's default conf file. If your conf is at 
 /etc/hiera.yaml, move it or tell puppet.conf where it is. 
 http://docs.puppetlabs.com/references/latest/configuration.html#hieraconfig
 - The hierarchy itself works the same, including fact interpolation. 
 - All four hiera functions are still there. No need to change their names.
 - The puppet backend is still there! That's one that we were planning to 
 remove at one point, and I don't yet have the whole story on how that went 
 down, but it did stay in. Or at least, it's in the source code; I don't 
 know how packages and gems deal with it, yet. 
 - The generic lookup function didn't happen. The built-in data_binding 
 code currently only applies to class parameters; we left an expansion of it 
 for a later date, once we have a deeper understanding of users' needs and 
 challenges.


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