* Ruby nested msg caps

* nested types tests added

* test cases added for RubifyConstant

* extracted NestedMessage to TestNestedMessage

* removed nested tests with leading underscore

* extracted testLowercase to toplevel testLowercaseNested

ObjC doesn't support them, but this ensure when tests are added
they will be handled correctly.

The conformance.proto was updated in PR #5566

Varadic assignment in javascript where the right hand expression is an
object yields a single set assignment with the right most lefthand variable,
while leaving the other left side expressions undefined.

For example:
var a,b = {}

will only initialize a to undefined. But will set b to the {} value.

--

For this code since f is never used, it is a safe operation to remove
it.

* Down-integrate internal changes to github.

* Fix BUILD file and regenerate csharp descritpor

Added a few \ on the comments to match the exceptions scope when is referenced while in a namespace. So the IDEs can be happy.

* Down-integrate internal changes to github.

* fix csharp conformance test

* add comments in conformance.proto for text format

* fix comments

* fix comments, re-generated csharp file

* fix comments, re-generated csharp file

Even though the comments were indented to appear to go with the jspb
case/field, protoc doesn't collect comments like that, so these "hanging"
comments actually "attach" to the next thing added to each.  Looking at
https://github.com/protocolbuffers/protobuf/pull/5566 you see where
the generated code picked up the comment on the wrong field.

* Down-integrate internal changes to github.

* fix python conformance test

* fix csharp conformance test

* add back java map_lite_test.proto's optimize for option

* fix php conformance test

* Fix Empty ListValue/Struct json encoding

* Add test for empty ListValue

Revert "Revert "Enable the ignore_unknown_field option in the Ruby unmarshal options" (#5511)" (#5533)

* Revert "Revert "Enable the ignore_unknown_field option in the Ruby unmarshal options" (#5511)"

This reverts commit be1716a6.

* Separate ruby conformance test on Mac

* Fix shell syntax

* Fix test

The CocoaPod (and source) have always support tvOS, but adding the project
makes it easier to run the tests and debug if there ever were an issue.

(not adding a watchOS project at the moment because Apple doesn't provide
 XCTest, so all it could do is build the library. We still support that,
 just can't "test" it.)

* Add ruby 2.6 gem build for linux

* Add docker hub organization

* Add ruby2.6 in cross compile targets

* Fix tests

* Check mac version

* No need to install php in preparation for mac

* Add ruby 2.6 test

* Fix broken tests

* Fix compatibility test

* Fix bundler version

* Use new docker image

* Fix broken test

* Use new docker image in ruby26 test

* Install ruby for mac

Clean up unnecessary compile warning with GCC

The -Wno-writable-strings warning flag is Clang-specific. GCC's
equivalent is -Wno-write-strings, which Clang also supports as a
synonym. So, -Wno-write strings is more compatible and there is no need
to specify both.

https://clang.llvm.org/docs/DiagnosticsReference.html#wwrite-strings
https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html

* Fix Any json encoding/decoding in php

* Fix comments

Enable the ignore_unknown_field option in the Ruby unmarshal options

Use NoLocalStrtod for international compliance

This adds the ability for the MRI Ruby library to optionally pass in a
ignore_unknown_fields option when decoding JSON. The functionality was
added upstream in upb, this change exposes that option.

Down-integrate internal changes to github.

Add conformance test for allow_alias with lower_case enums

Lower the severity of lower-case ruby enum to warning. Add conformance test for allow_alias with lower_case enums

Recieved errors pasing json files with decimal floats from European colleagues

* Rebuild python docker image

* Update docker image

* Change call to build_and_run_docker.sh

* Set up python tests for different versions

* Fix comments

Exclude command_line_interface_unittest.cc in MSVC build

* Fix benchmark to use docker image on kokoro

* Deleted pure php benchmark and fix long time benchmark

Removed Kokoro config for 64-bit Linux

This Kokoro configuration is no longer being used and the build.sh
script does not work anymore, so let's delete this configuration.

* Inherit from message instead of implement

When regestering class (implmenets other class) during MINIT, zend_class_implements
would call zend_class_entry->interface_gets_implemented(). In PHP-7.3 interface_gets_implemented shares the same location with create_object.
However, during MINIT, the global object storeage hasn't been initialized. And thus, caused segment fault in php 7.3.

* Use zend_string_init where interned string may be the value.
zend_string_dup will keep using the existing interned string.
In php 7.3, interned string cannot be destroyed from user's code.

* Uncommment debug code

* Use latest phpunit for each php versions

* Revert change in Dockerfile

* Update php test to use the new docker image

* Update composer

* Change docker organization

* Update phpunit

* Debug phpunit

* Store phpunit into bin dir in docker image

* Install valgrind to docker

* Fix compatibility test

* Remove generated_service_test from compatibility c extension test

* Update 32bit php test to the new docker image

* Install bison

* Fix build.sh

* Fix DOCKERIMAGE_PREFIX

* Fix basename

* Add comment to build_and_run_docker2.sh

* Remove commented code

* Fix comments