This temporarily reverts back to using @babel/runtime/helpers/* rather
than @babel/runtime/helpers/builtin/*, since some helpers (for example,
`slicedToArray`) were using code patterns that cannot be made to work via
polyfills in older browsers, e.g.
if (Symbol.iterator in Object(arr)) {...}
to test whether `arr` is iterable.
Note that we have to keep both babel-runtime and @babel/runtime for the
time being, since isopackets are compiled by an older (non-beta) version
of Babel that still generates babel-runtime imports.
While running the tests three times might make a lot of sence in CI
environments, it certainly slows things down in development, especially
when you've failed a test on purpose, but still have to wait for it to
run three times to get the output.
This not only implements the `--retries` flag, but also activates it in
both CircleCI and AppVeyor test suites.
Most of the work to prepare for this change was done through the
excellent work of @hwillson in meteor/meteor#9173 which, after some
re-working to support the 64-bit architecture on Windows platforms,
landed in meteor/meteor#9218, making this change as simple as bumping
the minor version number (and rebuilding the dev bundle).
From this point forward, and due to Mongo's discontinuation of 32-bit
support in newer versions of MongoDB, 64-bit platforms will, in
development, use newer versions of Mongo while 32-bit architectures
will remain at 3.2.x versions.
Of course, in production, apps are free to use whichever version of
Mongo they would like, provided that version is supported by the
Node Mongo driver and Meteor's Mongo data packages. At this time
there is no target for when Meteor will stop supporting Mongo 3.2,
but developers are encouraged to take steps to upgrade their Mongo
deployments (through their database providers) to newer versions
since Mongo has set September 2018 as the "End-of-Life" for Mongo
3.2.x. For more information on Mongo support cycles, see their
support documents at https://www.mongodb.com/support-policy.
Refs: https://github.com/meteor/meteor/pull/9173
Refs: https://github.com/meteor/meteor/pull/9218
