[Twisted-Python] Twisted vs jQuery Deferreds (was Re: RPC design questions)

[Allen Short]

No, this is something jQuery and CommonJS got wrong; callbacks don't chain
in their implementation.

Firing a jQuery promise invokes each callback in order with the same
argument. Firing a Deferred in Twisted invokes the first callback then
passes its return value as the arg to the next callback, and so forth.
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