Decision for 0063: Criteria for Carbon to go public (#187)

* Decision for 0063: Going Public

* Update proposals/p0063_decision.md

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>

* Update proposals/p0063_decision.md

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>

* Update p0063_decision.md

* Update README.md

Co-authored-by: Jon Meow <46229924+jonmeow@users.noreply.github.com>

proposals/README.md

@@ -32,6 +32,7 @@ request:
 -   [0051 - Goals](p0051.md)
     -   [Decision](p0051_decision.md)
 -   [0063 - Criteria for Carbon to go public](p0063.md)
+    -   [Decision](p0063_decision.md)
 -   [0074 - Change comment/decision timelines in proposal process](p0074.md)
     -   [Decision](p0074_decision.md)
 -   [0083 - In-progress design overview](p0083.md)

proposals/p0063_decision.md

@@ -0,0 +1,60 @@
+# Decision for: Criteria for Carbon to go public
+
+<!--
+Part of the Carbon Language project, under the Apache License v2.0 with LLVM
+Exceptions. See /LICENSE for license information.
+SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+-->
+
+Proposal accepted on 2020-11-03
+
+Affirming:
+
+-   [chandlerc](https://github.com/chandlerc)
+-   [gribozavr](https://github.com/gribozavr)
+-   [josh11b](https://github.com/josh11b)
+-   [noncombatant](https://github.com/noncombatant)
+-   [tituswinters](https://github.com/tituswinters)
+-   [zygoloid](https://github.com/zygoloid)
+
+Abstaining:
+
+-   [austern](https://github.com/austern)
+-   [geoffromer](https://github.com/geoffromer)
+
+## Open questions
+
+None.
+
+## Rationale
+
+"An open, inclusive process for Carbon changes" requires us to make the decision
+to go public in a clear and unsurprising way, with criteria that are written
+down.
+
+Going public too early introduces risks to the long-term evolution and
+maintenance of the language by increasing the costs of the community members
+developing it.
+
+Ensuring that Carbon meets its functional goals, especially that of
+interoperability and migration, will inherently require large scale
+experimentation that is infeasible to do without becoming public at some point.
+
+The core team is aligned on the core policy decisions, which are:
+
+-   The decision to go public will go through the usual proposal process.
+-   The structure of the proposal gives the things that we are looking for prior
+    to going public.
+-   We expect to delay announcing to the extent we can.
+-   We do not expect that to be so late that everything is done and we are ready
+    to ship. That is, we are not going to wait until version 1.0 is ready.
+    -   We don't expect this to be so late that Carbon is no longer an
+        experiment.
+
+Changes to the text and wording that align with these items should be submitted
+as code reviews. The core team members chandlerc and zygloid will both approve
+each code review.
+
+An example change that would be covered by a code review: there will be no
+automatic going public just because the criteria are met -- it will be a
+decision of the core team.