There is one context where failure as exceptions can be a bit ugly is in core
async channels but there are a few ways to deal with this, from separating
channels for exceptions, using some kind of named tuple, map or just
dispatching with instance? It is just a side effect of core async design w
It's arguable. Exceptions give you a somewhat clean way of pattern match their
type and dealing with failures in a single place in an uniform way. Ex having
to deal with not ok http status codes and then a potential low level networking
exception at the same level is good imho.
I tend to use e
This seems quite similar to https://github.com/ztellman/primitive-math. Did
you know about it?
On Monday, July 3, 2017 at 11:44:40 AM UTC+2, Phillip Lord wrote:
>
>
>
> This is the first alpha release of my new library! Comments welcome.
>
> Clojure has an extensive system for dealing with numbe
Hi,
It's by design, as the doc of s/keys states:
In addition, the values of *all* namespace-qualified keys will be validated
(and possibly destructured) by any registered specs. Note: there is
no support for inline value specification, by design.
So if the ns'ed key in your map is registered a
There are new/related issues that crept up with this release fyi.
I would personally wait the next one for an upgrade in production:
http://dev.clojure.org/jira/browse/ASYNC-187
http://dev.clojure.org/jira/browse/ASYNC-186
On Wednesday, February 22, 2017 at 7:58:27 PM UTC+1, Gary Trakhman wrote
You do nothing for the while loop to end
(while true
... ))
This will still eat cpu time (a lot if there's no "pause" inside, empty
chan/takes inside or not.
That's why usually you use loop/recur with a condition of the take!
result or put! result in case of push.
(go-loop []
(when-let [x (
Another way is to provide the specs as a separate (or "sub") project. You then
dont have to care about clojure versions, potential aot issues etc.
I do this in https://github.com/mpenet/alia
The same approach is taken with all features that could be considerrd
opinionated and relying on extern
He happens to be one of the original Erlang authors/designers.
There's also a side project of LFE that attempts to make things more
clojur'esque in LFE https://github.com/lfex/clj. As for right now LFE
shares more similarities with Common Lisp than with Clojure or Racket (lfe
is a Lisp2). Person
And I fogot to mention the changelog!
https://github.com/mpenet/alia/blob/master/CHANGELOG.md#changelog
On Friday, January 29, 2016 at 12:06:57 PM UTC+1, Max Penet wrote:
>
> Alia is reaching 3.0.0, following its parent project
> datastax/java-driver. It covers the most recent featur
ithub.com/mpenet/alia
or clojars: https://clojars.org/cc.qbits/alia
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I doubt it such a big deal actually.
You can run multiple versions of the java on the same machine. The
only issue would be for legacy projects that are frozen to java 6 and
would like to upgrade to a lib (like clojure) relying java8. But I
doubt such projects are the norm, and the few that are p
Hi,
It doesn't seem to work for me, I get " invalid_preface" error returned
by the server (tried with latest firefox, chrome, chromium on linux).
I will give nghttp2 a go, maybe me env is somehow busted, but other http2
websites (webtide, google etc) work fine on http2.
Cheers,
Max
On Su
New release of Alia, the lean cassandra driver for clojure.
https://github.com/mpenet/alia
Alia focuses on performance, stability, simplicity, extensibility,
being feature complete and tries to expose java-drivers' API in a
clojure friendly way.
It provides a "blocking" API, but also has interf
We've been running Oracle JDK8 on 30'ish servers (clj based web api,
aggregation/streaming service, cassandra 2.1+, elastic search, etc) without
any (noticeable) hiccups for a couple of weeks here.
On Thursday, May 7, 2015 at 10:25:13 PM UTC+2, Pierre-Yves Ritschard wrote:
>
> Hi,
>
> There
I think the problem is that it's listed on the autodoc
page http://clojure.github.io/core.async/ , hence the confusion.
On Monday, March 23, 2015 at 4:50:57 PM UTC+1, tbc++ wrote:
>
> Unfortunately this isn't even in the latest alphas.
>
> Probably your best bet is to checkout a copy of core.as
HI,
You might want to use an even more recent version of jetty9 see:
https://github.com/eclipse/jetty.project/blob/cfca172dd68846b2c7f30a9a6b855f08da7e7946/advisories/2015-02-24-httpparser-error-buffer-bleed.md
On Thursday, March 12, 2015 at 6:52:09 PM UTC+1, Chris Price wrote:
>
> Hi! Just
Jet is already very usable and used in production by some notable
projects/clients.
I am also working on improving the backpressure story on all fronts at the
moment (matter of few days at most).
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To p
I did the same recently, you can already leverage transducer support in
core.async while staying backward compatible with clojure 1.6. You loose
some sugar and the transducer versions of most sequences functions but it's
very usable still.
you can see 2 examples here:
https://github.com/mpene
Just curious, why http://dev.clojure.org/jira/browse/CLJ-1517 didn't make
it. It seemed complete at first glance.
On Tuesday, October 28, 2014 9:53:05 PM UTC+1, Alex Miller wrote:
>
> We will definitely be rolling this particular aspect of CLJ-1330 back in
> the next release.
>
> Alex
>
> On Tu
This is something that should be configurable & extendable in core.async
really... but given how long it took to have this possibility with agents I
am not holding my breath (not to mention it was never even considered for
c.c/future).
On Tuesday, October 7, 2014 8:48:23 PM UTC+2, Brian Guthrie
Jet supports what you were trying to do, it accepts a channel as return
value to send the response to the client, and in the :body of the response
(no matter the kind of response via a channel or map) to trigger chunked
responses.
see here https://github.com/mpenet/jet#ring-async
On Saturday,
Jet supports what you were trying to do, it accepts a channel as return
value to send the response to the client, and in the :body of the response
(no matter the kind of response via a channel or map) to trigger chunked
responses.
see here https://github.com/mpenet/jet#ring-async
On Saturday,
You can use nginx as reverse proxy, load balance on 2 apps that are running
on 2 different ports, and manage to always leave one alive when doing
deploys.
clojars has some document (probably not very up to date) about this kind of
setups:
http://p.hagelb.org/clojars-deploy
On Thursday, Sept
Jet [1] is a lightweight library for using Jetty9 from clojure.
Jetty9 is interesting (compared to 7 or 8) mostly due to the fact that
its core has been rewritten to take advantage of Async IO and it
brings first class support for WebSocket among other nice things.
There's an old'ish post that de
core.async channel, with fine control
over the streaming process via core.async "takes" or interupting the
streaming via core.async close!.
On Wednesday, August 27, 2014 11:25:29 AM UTC+2, Max Penet wrote:
>
> Alia is a thin wrapper around "java-driver" by Datastax.
>
&
Alia is a thin wrapper around "java-driver" by Datastax.
Datastax's java-driver 2.1 final was released yesterday, Alia was brought
up to speed with this release, adding support for the latest features from
the library it wraps and cassandra 2.1+
If you have no idea what I am talking about you
For "web stuff" we use jetty (9) apps as uberjar, behind nginx, deployed
and C&C via ansible, hosted on DigitalOcean as well.
Ansible is super easy to get started with and can grow to complicated
setups relatively painlessly, can't say enough good things about it.
On Wednesday, August 20, 2014
To give credit where it is due: thanks for the great suggestion(s) :)
On Thursday, May 22, 2014 12:17:25 PM UTC+2, coltnz wrote:
>
> Alia / Hayt are a great combo thanks Max!
>
> I'm looking forward to trying Cassandra as a lazy-seq.
>
> Colin
>
>
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ELOG.md
6. http://mpenet.github.io/hayt/codox/qbits.hayt.html
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Hi,
And there's Storm that could be worth mentioning... used by some (very)
large companies (twitter ,groupon, etc...) and a success story. Also
prismatic is a good example, and I could mention more companies/products,
some that were acquired by big players, others used by millions, netflix
c
One of the possibility is to use joda-time DateTimeFormatter (directly or
via one of the clojure wrappers).
On Saturday, April 12, 2014 1:24:22 PM UTC+2, Cecil Westerhof wrote:
>
> 2014-04-12 11:40 GMT+02:00 Max Penet >:
>
>> Be aware that SimpleDateFormat is not threadsafe t
Be aware that SimpleDateFormat is not threadsafe though.
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Note that posts from new members are moderated - please be patient with your
first
about 1. if that's meant to be portable, yes, not the best indeed, but if
you look at c.c.string/* or even c.c/str, most of the functions use
stringbuilder I think.
about 2. probably slower than subs, these are just alternatives to what you
suggested
On Wednesday, April 2, 2014 1:06:40 PM UTC+2
There are many ways to do this, these 2 come to mind:
(doto (StringBuilder. "abc") (.setCharAt 2 \d))
(apply str (assoc (vec "abc") 2 "d"))
The former is probably a lot faster (uglier too)...
On Wednesday, April 2, 2014 12:10:48 PM UTC+2, Andy Smith wrote:
>
> Hi,
>
> I see there are a lot of
FYI there is also this one on github:
https://github.com/sunng87/ring-jetty9-adapter
On Thursday, January 23, 2014 11:39:45 PM UTC+1, Andrey Antukh wrote:
>
> Hi!
>
> I have port the current ring-jetty-adapter from current ring repository to
> use jetty 9.1.1 version.
>
> I understand that cur
Well not quite:
> (contains? (transient #{1 2 3}) 1)
false
> *clojure-version*
{:major 1, :minor 4, :incremental 0, :qualifier nil}
>
So it used not to throw but return a wrong value instead, which was worse.
On Wednesday, December 4, 2013 2:50:19 PM UTC+1, Max Penet wrote:
&g
Also it seems it used to work on clojure 1.4
On Wednesday, December 4, 2013 2:29:35 PM UTC+1, Stefan Kamphausen wrote:
>
> It looks like you're onto something here
>
> get works with transient maps:
>
> (get (transient {:a 1 :b 2}) :a)
> ;=> 1
>
> and with transient vectors, too:
>
> (get (transie
The best you can do is probably mess with
https://github.com/technomancy/serializable-fn, but maybe trying to
describe what you are trying to do at a higher level would help, most of
the time using serializable-fn is a bad idea (symptom of one).
On Thursday, November 21, 2013 7:14:39 PM UTC+1,
Looks good!
I am wondering though, why not merging your work on the parent project
instead of creating a new one (with a new name etc), you seemed to be on
your way of doing just this?
On Thursday, November 21, 2013 5:38:16 PM UTC+1, Chas Emerick wrote:
>
> Reid Draper's simple-check[1] is a
It's a real problem for me too, I also wonder what was the intention behind
this. I guess there could be a very good reason for this special treatement
of nils, but I haven't seen it yet.
I would love to hear about this from people involved in core.async
development.
On Friday, August 16, 201
Hi,
Partial calls apply, so it's not as performant as #(..). That can make
quite the difference depending on where it's used. All instances of partial
were removed recently in carmine/nippy and that resulted in quite a
performance improvement.
On Tuesday, August 13, 2013 2:47:01 PM UTC+2, Jay
Honeysql is nice but it only supports select statements FYI.
That said it's probably easy to extend, but my point is that it's far from
complete, so I am not sure it's a good recommendation at the moment.
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//blog.clojurewerkz.org/blog/2013/07/09/cassaforte-1-dot-0-1-is-released/
>
> The ClojureWerkz team would like to thank Max Penet for helping us shape
> up what
> Cassaforte is, making an excellent CQL DSL library available and
> supporting us in general,
> even though w
You don't need apply, you can just use into:
user> (into {} [{:apple "red and crunchy"} nil nil {:Numb 1} nil nil
{:Field "FRUIT.Description"}])
{:apple "red and crunchy", :Numb 1, :Field "FRUIT.Description"}
On Monday, July 8, 2013 5:01:20 PM UTC+2, VaedaStrike wrote:
>
> So I have data struct
My rule of thumb for this is if that's something that will be "static" (as
in, set once in the source and never changes) kw options are fine, if it is
likely to be manipulated, is the result of some previous computation, then
a map fits better.
apply also has a performance cost that's not alwa
What OS? Emacs of course.
More seriously debian (with a lightweight xmonad config), at work and at
home.
I tried OSX a couple of years back (for about a year), and there were just
too many annoyances, weird keyboard shortcuts, broken package managers,
proprietary stuff everywhere, payware (and
H2 sounds like the safe choice.
You could also try/evaluate the latest
mapdb: https://github.com/jankotek/MapDB#features
It very easy to use from clojure but I only used it on trivial stuff
however, and it's still considered alpha.
On Sunday, May 26, 2013 5:09:51 PM UTC+2, Cedric Greevey wro
Hi,
Some nice improvements here, thanks!
- Max
On Saturday, May 11, 2013 3:53:02 PM UTC+2, Ambrose Bonnaire-Sergeant wrote:
>
> Hi,
>
> Announcing a new release of core.typed, with a bunch of improvements and
> fixes.
>
> Leiningen: [org.clojure/core.typed "0.1.14"]
>
> Highlights:
> - support
Hayt [1] is a CQL3 DSL allowing to compose queries from clojure functions
and/or maps.
Alia [2] is a full featured Cassandra client built on top of DataStax newly
released java-driver [3] with a simple, yet powerful API and query DSL
(Hayt).
Detailed announcement: http://bit.ly/17a0zfQ
[1]
Right! My bad.
On Friday, April 26, 2013 2:44:21 PM UTC+2, Ji Zhang wrote:
>
> Besides, correct me if I'm wrong, the clojure map function returns a lazy
> seq, and reduce consumes it, so there's actually only one loop, right?
>
> On Friday, April 26, 2013 8:23:04
Hi,
In reducer-reduce you iterate twice over the values compared to the java
version, once in map (just to call .get), then in reduce.
There are other issues probably, but this is one of the obvious ones.
On Friday, April 26, 2013 12:05:33 PM UTC+2, Ji Zhang wrote:
>
> Hi,
>
> I'm writing map
Nevermind, I just noticed it was marked to be applied in 1.5.
On Sunday, April 14, 2013 11:36:45 PM UTC+2, Max Penet wrote:
>
> into doesn''t preserve metadata (clj-1.4).
>
> > (meta (into (with-meta {} {:foo :bar}) {}))
> nil
>
> There was an Issue ab
into doesn''t preserve metadata (clj-1.4).
> (meta (into (with-meta {} {:foo :bar}) {}))
nil
There was an Issue about it, but it was closed:
http://dev.clojure.org/jira/browse/CLJ-916
On Sunday, April 14, 2013 11:01:26 PM UTC+2, Marko Topolnik wrote:
>
> Yes, it is meant to preserve metadat
I am curious, what data store are you interacting with?
On Wednesday, April 3, 2013 2:01:33 PM UTC+2, Ryan wrote:
>
> Most SQL Database support array types natively
>
>
> If you are using MySQL unfortunately there isn't and the OP (including
> myself) probably needs this because his RDBMS does n
uot;jim" "jon" "chris"))
> ("jim" \, "jon" \, "chris")...
>
> once you have that pr-str is your friend...
>
> =>(apply pr-str (interpose \, (list "jim" "jon" "chris")))
> "\"jim\&qu
Using a protocol fn to do the encoding of the values according to the rules
you set per type then using clj.string/join should be quite fast and not so
horrible.
On Thursday, October 28, 2010 2:18:08 AM UTC+2, andrei wrote:
>
> Hi all,
>
> I work with a database and need a function, that will
You are mistaken :)
try:
(apply str [:a :b :c])
(apply str [:a :b :c :d :e])
> (doc apply)
-
clojure.core/apply
([f args] [f x args] [f x y args] [f x y z args] [f a b c d & args])
Applies fn f to the argument list formed by prepending intervening
arguments to args.
nil
+1
fetch also has some bugs that will bite you sooner or later, it's not
maintained anymore (and I don't think anyone took over).
On Thursday, March 21, 2013 4:34:44 PM UTC+1, Paul deGrandis wrote:
>
> If you're up for the challenge, I'd encourage you to migrate from Noir to
> Compojure+Ring a
(swap! remaining rest)
> (case->event current features-extractor labeler)))
> (hasNext [this] (not (empty? @remaining))
>
> May I ask why that would be faster? And when proxy is preferred over reify?
>
> Joachim.
>
> 2013/2/14 Max
Also It looks like you could use reify instead of proxy here, it would
improve performance.
http://clojuredocs.org/clojure_core/clojure.core/reify
- Max
On Thursday, February 14, 2013 3:26:02 PM UTC+1, Ulises wrote:
>
> Without testing or anything that looks reasonable enough. I'm sure that
Hi,
I made a small library a while ago to help with this. It wraps different
java executors and has a version of clojure future and future-call that
allows you to pass an executor as argument:
https://github.com/mpenet/knit
(require '[qbits.knit :as k])
(def x (k/executor :fixed :num-threads
Hi,
jayq includes something similar (nicer imho). It takes the form of a let
like construct
(let-deferred
[a (jq/ajax "http://localhost:8000/1.json";)
b (jq/ajax "http://localhost:8000/2.json";)] (do-something-with-result
(merge a b foo)))
It also supports :let and :when intermedia
You need to use a more recent clojurescript version (you are missing
clj->js from cljs.core).
see
https://github.com/ibdknox/jayq/blob/master/CHANGELOG.md#200-breaking-changes
On Saturday, January 19, 2013 4:02:29 AM UTC+1, Ari wrote:
>
> I also noticed that when I compile the cljs code I get
jayq [1] now supports jQuery deferred API , there are 2 examples of its use
with these 2 macros: let-ajax and let-deferred (see the readme).
[1] https://github.com/ibdknox/jayq
On Tuesday, November 27, 2012 12:51:22 AM UTC+1, FrankS wrote:
>
> All this call-back stuff drives me crazy in Clojur
Strong +1
This is a great idea.
This would allow more flexibility in some corner cases and
prevent unnecessary duplication, not to mention sharing.
Another example: I believe crate compiles templates using the DOM API,
which is often fine, but sometimes you'd want it to do this using raw
stri
It's probably the use of single quotes, which results in a quoted symbol
Clojure> 'f'
f'
On Saturday, November 10, 2012 6:20:06 PM UTC+1, larry google groups wrote:
>
> In MySql I have a table with a field called is_top_winner and this is
> defined as char(1). In Clojure I have this function:
>
:42 PM UTC+2, Casper Clausen wrote:
>
> +1 That would be nice. This may not be the right place for the suggestion
> though.
>
> On Thursday, October 25, 2012 2:43:58 PM UTC+2, Max Penet wrote:
>>
>> wrong commit:
>> https://github.com/mpenet/clojure/commit/9c6e475
wrong commit:
https://github.com/mpenet/clojure/commit/9c6e47524dc21c6bdfaa9d0cc2a69377cc69cbf3
On Thursday, October 25, 2012 2:35:01 PM UTC+2, Max Penet wrote:
>
> Another enhancement proposal, would it be possible to have a future-call
> arity with an additional argume
Another enhancement proposal, would it be possible to have a future-call
arity with an additional argument as the ExecutorService used. It seems to
be a trivial but useful modification, but I wanted to ask here before
creating a ticket for this.
Something like this maybe:
https://github.com/m
Thanks, perfect, I had prepared a patch that was identical.
On Thursday, October 25, 2012 2:11:44 PM UTC+2, Tassilo Horn wrote:
>
> Tassilo Horn > writes:
>
> >>> user> ((some-fn) )
> >>> false
> >>> user> ((every-pred) )
> >>> true
> >>>
> >>> e.g. (some-cn) was equivalent to (constantly fa
On Thursday, October 25, 2012 12:49:32 PM UTC+2, Tassilo Horn wrote:
>
> Max Penet writes:
>
> > user> ((every-pred (fn [_])))
> > true
> > user> ((some-fn (fn [_])))
> > nil
> >
> > Shouldn't the first example return false? s
user> (every? identity [])
true
I think I understand now, this might be to match the behavior of "every?".
Max
On Thursday, October 25, 2012 12:31:57 PM UTC+2, Max Penet wrote:
>
> Hello,
>
> I am trying to understand the rationale behind the current implementation
&g
Hello,
I am trying to understand the rationale behind the current implementation
of some-fn and every-pred, there seems to be a couple of odd things, or
maybe that is just me misunderstanding their doc.
user> ((every-pred (fn [_])))
true
user> ((some-fn (fn [_])))
nil
Shouldn't the first exam
Good point, I forgot about this case.
On Monday, October 22, 2012 7:02:41 PM UTC+2, David Nolen wrote:
>
> On Mon, Oct 22, 2012 at 12:52 PM, Max Penet >wrote:
>
>> This reminds me, maybe having something like this function, probably with
>> its protocol in core
You can get a fix from my fork cc.qbits/jayq "0.1.0-alpha4-SNAPSHOT"
or just use your
own:
https://github.com/mpenet/jayq/commit/d26615f26f012093e02bd89df893fb6e993830e6
On Monday, October 22, 2012 5:44:11 PM UTC+2, Pierre Allix wrote:
>
> Hello everybody,
>
> I'm having a bug with the followi
This reminds me, maybe having something like this function, probably with
its protocol in core would be nice. Thoughts?
On Monday, October 22, 2012 6:46:41 PM UTC+2, Max Penet wrote:
>
> Hi,
>
> jayq relies on .-str-obj to serialize maps, which doesn't exist on
> Persista
Hi,
jayq relies on .-str-obj to serialize maps, which doesn't exist on
PersistantHashMaps (it turns into one once you insert the 33rd element).
It should use aset instead I guess. By the way there is a map->js function
you can use in the meantime.
On Monday, October 22, 2012 5:44:11 PM UTC+2,
Google also has something similiar, and it has probably been checked by an
army of layers.
http://code.google.com/legal/individual-cla-v1.0.html
On Sunday, October 7, 2012 2:25:36 AM UTC+2, Ben Mabey wrote:
>
> On Oct 6, 2012, at 6:04 PM, Michael Klishin
> >
> wrote:
>
>
>
> 2012/10/7 Softaddi
+1
Accepting CAs by mail would be very welcome.
The impact of this until now is something quite difficult to measure, since
potential contributors maybe never voiced their interest and just quit when
they get to know the effort (or cost) required. But it probably makes a
difference when a pr
Sorry about the horrible formatting, blame google groups interface.
Max
On Jan 28, 7:16 pm, Max Penet wrote:
> Hello David,
> This is interesting!
> The JavaScript behavior is definitively not a good one, that said the
> only thing that I think could do more harm than good is th
Hello David,
This is interesting!
The JavaScript behavior is definitively not a good one, that said the
only thing that I think could do more harm than good is the fact these
checks are enabled by default. I am not sure the majority of cljs user
will want to take a performance hit (or have to set a
Well it *should*, now that I think of it, I am not using clojure-jack-
in so it might be different.
On Jan 20, 12:08 am, Max Penet wrote:
> Hello,
>
> This should do it:
>
> (add-hook 'slime-repl-mode-hook 'clojure-mode-font-lock-setup)
>
> On Jan 19, 10:52 pm
Hello,
This should do it:
(add-hook 'slime-repl-mode-hook 'clojure-mode-font-lock-setup)
On Jan 19, 10:52 pm, Ben Smith-Mannschott
wrote:
> I'm trying to get syntax highlighting (font-lock) to work in the
> repl buffer provided by slime as described
> here:https://github.com/technomancy/swank-
On Sep 10, 9:33 pm, Max Penet wrote:
> You can use goog.dom/getChildren to get the children (I think it will
> exclude the non-Nodes such as text and comments)
I meant "non Element Nodes"
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You can use goog.dom/getChildren to get the children (I think it will
exclude the non-Nodes such as text and comments ) but it will return
an HTMLCollection doesn t implement ISeq, so you need to transform it
to a regular js array with goog.array/toArray.
something along these lines:
(ns dom-mani
Imho, you get everything google closure is good at (great compiler,
huge library, dependency management/resolution, stability/support)
without having to follow OO style closure encourages, with the joy of
working with clojure, it's abstractions/semantics/ecosystem, and the
ability to share code be
Thanks! This looks really good.
I hope this ends up in contrib at some point, also looking forward to
its extension (guards & co).
On Aug 9, 7:49 am, David Nolen wrote:
> Ambrose and I have been working on a high performance pattern matching
> library for Clojure. There's much left to do but it'
Hi,
Try adding this line to your .emacs:
(setq slime-net-coding-system 'utf-8-unix)
On Jun 26, 1:34 pm, Gregg Reynolds wrote:
> Hi,
>
> This seems to be an emacs problem. I'm trying to read a file with utf-8
> text using (slurp "foo.txt") in an emacs slime session. It chokes and
> says:
>
>
Hi,
Hi,
I live in Geneva too.
I recently found out (thanks to Christophe Grand) there are a few
Clojure users around here.
Max
On Apr 14, 10:07 pm, Ivan Koblik wrote:
> Hello,
>
> I'll be the third guy from Switzerland :) I live in Geneva... Any Clojurians
> from Suisse romande?
>
> Cheers,
>
into-array can do that for you:
user=> (doc into-array)
-
clojure.core/into-array
([aseq] [type aseq])
Returns an array with components set to the values in aseq. The
array's
component type is type if provided, or the type of the first value
in
aseq if present, or Obj
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