Mar 2018 Meeting

calendar_today March 15, 2018 confirmation_number 47 tickets discussed Source English

DevMeeting-2018-03-15

Date: 2018/03/15 (Thu) Time: 14:00-18:00 (JST) Place: Cookpad, Inc. Sign-up: https://connpass.com/event/80317/ Attendees: Martin Dürst (from ~16:00) (add your name here if you would like to participate) Regrets: (add your name here if you often attend, but can’t attend this time) Language: mostly Japanese (sorry for non native Japanese speakers)

Please add your favorite ticket numbers you want to ask to discuss.

  • NOTE
    • Dev meeting IS NOT a decision making place. All decisions should be done at the bug tracker.
    • Dev meeting is a place we can ask Matz, nobu, nurse and other developers directly. Matz is a very busy person. Take this opportunity to ask him. If you can not attend, other attendees can ask instead of you (if attendees can understand your issue).
    • We will write a log about discussion to a file or to each ticket in English.
    • All activities are best-effort (keep in mind that most of us are volunteer developers).
    • The date, time and place is scheduled according to when/where we can reserve Matz’s time.

Agenda

  • NOTE: Write at least “ticket number/title/link” and your name (see example below). Explain details on the ticket. If you cannot attend the meeting, we appreciate a short summary because we can understand it more easily (long discussion is difficult to read, especially in a non-native language). Your motivation is also welcome.

About 2.6 timeframe

  • [[ruby-master:ReleaseEngineering26]]

From attendees

  • [Feature #12732] An option to pass to Integer, Float, to return nil instead of raise an exception (mrkn)
  • [Feature #14476] Adding same_all? for checking whether all items in an Array are same (mrkn)
  • [Feature #14362] use BigDecimal instead of Float by default (mrkn)
  • [Feature #14044] Introduce a new attribute step in Range (mrkn)

From non-attendees

  • [Feature #14245] Add File.read etc. (shugo)
  • [Feature #14579] Hash value omission (shugo)
  • [Bug #14541] Class variables have broken semantics, let’s fix them (eregon). I’d like more opinions and thoughts on whether we can change them.
  • [Bugs #14380] Change Hash#transform_keys! and break compatibility with Ruby 2.5 and ActiveSupport, or not?
  • [Feature #11473] Immutable String literal in Ruby 3 (hsbt): Do you really want to change it at Ruby 3? If It’s yes, We should add a warning with destructive action on Ruby 2.6.

Carry-over from previous meeting(s)

  • matz
    • [Feature #4514] #deep_clone and #deep_dup for Objects
    • [Feature #4521] NoMethodError#message may take very long to execute
    • [Feature #4539] Array#zip_with
    • [Feature #4592] Tempfileを直接保存したい
    • [Feature #4780] String#split with a block
    • [Feature #4818] Add method marshalable?
    • [Feature #4824] Provide method Kernel#executed?
    • [Feature #4907] enumerable#permutation and combination
    • [Feature #4910] Classes as factories
    • [Feature #5007] Proc#call_under: Unifying instance_eval and instance_exec
    • [Feature #5064] HTTP user-agent class
    • [Feature #5129] Create a core class “FileArray” and make “ARGF” its instance
    • [Feature #5133] Array#unzip as an alias of Array#transpose
    • [Bug #5179] Complex#rationalize and to_r with approximate zeros
  • nobu
    • [Feature #2324] Dir instance methods for relative path
    • [Bug #3618] inf-ruby prompt and tab completion
    • [Feature #4924] mkmf have_header fails with C++ headers
  • ko1
    • [Feature #2447] reduce GC pressure by symbol table without String instance
    • [Feature #3187] Allow dynamic Fiber stack size
    • [Feature #3731] Easier Embedding API for Ruby
    • [Bug #4040] SystemStackError with Hash[*a] for Large a
  • naruse
    • [Feature #2567] Net::HTTP does not handle encoding correctly
    • [Feature #2631] Allow IO#reopen to take a block
    • [Bug #4173] TestProcess#test_wait_and_sigchild が、たまに失敗する
  • akr
    • [Feature #3608] Enhancing Pathname#each_child to be lazy
    • [Feature #3848] Using http basic authentication for FTP with Open URI
    • [Feature #4560] [PATCH] lib/net/protocol.rb: avoid exceptions in rbuf_fill
  • knu
    • [Feature #3953] TCPSocket / UDPSocket do not accept IPAddr objects.
  • mame
    • [Feature #4247] New features for Array#sample, Array#choice
  • suke
    • [Bug #4405] WIN32OLE & Threads incompatible
  • kosaki
    • [Feature #4464] [PATCH] add Fcntl::Flock object for easier use of POSIX file locks
  • yugui
    • [Feature #4831] Integer#prime_factors
  • hsbt
    • [Bug #5060] Executables in bin folder conflict with their gem versions.
  • anyone
    • [Feature #4017] [PATCH] CSV parsing speedup
    • [Bug #4157] test_pty で、たまに出る Failure
    • [Feature #4483] PStoreをデフォルトで複数のスレッドから扱えるようにしたい

Log

Date: 2018/03/15 (Thu)

Time: 14:00- 18:00 (JST)

Place: Cookpad Inc.

Sign-up: https://ruby.connpass.com/event/73509/

log edit: https://docs.google.com/document/d/1RT0ijSo8uJ4Awn3CEvuYkjH0TVeXSYgeAFNmVGYC3ak/edit#

log: TBD

Agenda

Next Developper Meetings

2018/04/19 (Thu) @ Speee

About 2.6 timeframe

  • Preview 1 has been released with MJIT.

Stable versions

Hopefully, there will be a release in March.

Maintainers starting Apr 2018:

  • 2.2: EOL
  • 2.3: usa
  • 2.4: usa
  • 2.5: nagachika

From attendees

  • [Feature #12732] An option to pass to Integer, Float, to return nil instead of raise an exception (mrkn)

  • Resolved

  • Mrkn will file the conclusion.

  • [Feature #14476] Adding same_all? for checking whether all items in an Array are same (mrkn)

  • Definition of “same”? -> \==, for mrkn’s case
  • Empty array? -> true, [].all?{} #=> true
  • same_all? -> bad name: unnatural English
  • all_same? Or all_equal? -> natural, but it seems to use Object#equal? (assert_same uses Object#equal?)
  • uniform? -> “uniform array” means an array contains same type values
  • constant? -> easy to misunderstand
  • uniform_values? -> verbose

  • Usage examples:

  • ary.all_equal?
  • ary.all_equal?{ e e.foo}
  • ary.all_same?
  • ary.all_same?{ e e.foo}
  • ary.uniform?
  • ary.uniform?{ e e.foo}
  • ary.uniform_values?
  • ary.uniform_values?{ e e.foo}

  • [Feature #14362] use BigDecimal instead of Float by default (mrkn)

  • Reject; Unacceptable performance & too incompatible

  • Matz will respond.

  • [Feature #14044] Introduce a new attribute step in Range (mrkn)
# current

p 1.step(10, by: 2) #=> #<Enumerator: 1:step(10, {:by=>2})>

p 1.step(by: 2)         #=> #<Enumerator: 1:step({:by=>2})>

# extend

class Enumerator::ArithmeticSequence < Enumerator

 def first; end # already in Enumerator

 def last; end  # new

 def step; end  # new

 def inspect

 ...

 end

end

p 1.step                #=> (1.step)

p 1.step(10)            #=> (1.step(10))

p 1.step(10, by: 2) #=> (1.step(10, by:2))

p 1.step(by: 2)         #=> (1.step(by:2))

From non-attendees

  • [Feature #14245] Add File.read etc. (shugo)

  • Accepted

  • FYI: On 2.5, deprecation warning is added for this feature. We’ll remove this feature on 2.6.

  • [Feature #14579] Hash value omission (shugo)

  • Reject because matz doesn’t like it.

  • [Bug #14541] Class variables have broken semantics, let’s fix them (eregon). I’d like more opinions and thoughts on whether we can change them.

  • usa: I use class variables in a correct way when I love class variables
  • ideas:
  1. Prohibit inheritance; turn it into just a instance variable of a class; leave @@ just for compat
  • Incompatibility
  • confusion
  1. Remove class variables
  • huge incompatibility
  1. Prohibit toplevel cvar assignment (because we already show warning without -w option)
  2. Show stronger warning

Example of “toplevel” and “overtaken”  warning; note that “overtaken” is only shown with -w.

% ruby -w -e '
class A
 @@v = :A
 def self.show() p @@v end
end
class B
 @@v = :B
 def self.show() p @@v end
end
A.show
B.show
@@v = :TOP
A.show
B.show
'
:A
:B
-e:12: warning: class variable access from toplevel
-e:4: warning: class variable @@v of A is overtaken by Object
:TOP
-e:8: warning: class variable @@v of B is overtaken by Object
:TOP

  • Matz likes changing warnings to error

  • Both “toplevel” and “overtaken” warning

  • (Hopefully) We’ll release preview2 soon, it’s good timing to release this change early

  • What exception class to raise?

  • Use existing: ScriptError, SecurityError?

  • Create new: ClassVariableError, BadSmellError, DeprecatedError, ObsoleteBehaviorError?

  • What if we mistake, bit difficult to remove it later

  • Matz approved NameError

  • [Bugs #14380] Change Hash#transform_keys! and break compatibility with Ruby 2.5 and ActiveSupport, or not?

  • It’s considered bug. amatsuda says ActiveSupport will follow Ruby 2.6.

  • [Feature #11473] Immutable String literal in Ruby 3 (hsbt): Do you really want to change it at Ruby 3? If It’s yes, We should add a warning with destructive action on Ruby 2.6.