Re: [streams] Real time source and skipping (#383)

What I don't understand is how you would implement your latch transform without un-necessarily pulling from the source, i.e. keep the back pressure info through the transform.

The diagram really looks like any other read from a pull-source backed stream. What's important is that the consumer doesn't care about the type of source, it's logic should be the same.

![pull source](http://www.websequencediagrams.com/cgi-bin/cdraw?lz=cGFydGljaXBhbnQgIlB1bGwgU291cmNlIiBhcwAEBwoAFw1SZWFkYWJsZSBTdHJlYW0AIgYABgUAGw1Db25zdW1lcgAwDVByb2Nlc3NvcgoKABgILT4rAEMGOiAucmVhZCgpCgoAVAYtPisAgQUGOiBwdWxsKCkKbm90ZSBsZWZ0IG9mAIEgBzogQ2FwdHVyZSBzY3JlZW4KAIE4Bi0tPi0ATwhlbnF1ZXVlKHZhbHVlMQBVCi0-LQCBHQg6IAAXBgCBCgwAgSMJOiAucACBMgYAOQoAgUAJADgOIiIAgTwdAH1bMgBVCQCBRRIyCg&s=default)

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