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How would I go about installing the CLI that includes this PR <https://github.com/pulumi/pulumi/pull/2000>?

I'll start by warning that a variety of things may not work well if you take builds from master that have not been released yet :slightly_smiling_face:.  And that we plan to do another CLI release soon (later this week or early next week).

That said - you can get fresher bits two ways:
1. Build yourself from the repo at <https://github.com/pulumi/pulumi>
2. Download and manually install dev builds

For (2),  you should in general be able to get not-yet-released downloads from a URL like <https://get.pulumi.com/releases/sdk/pulumi-v0.15.5-dev-1538513283-g6e29ada4-darwin-x64.tar.gz>.  No great way to get a list of these or just "latest" - but the versions currently match the dev builds published for `@pulumi/pulumi` on the version tab of <https://www.npmjs.com/package/@pulumi/pulumi>.  Then follow installation steps similar to <https://get.pulumi.com/>.