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Consider adding LazyIO and friends #525

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@sobolevn

The thing about IO in multiple languages / libraries is that it is lazy.

Our IO is not lazy by design. It is done, so Python developers can use it like so: impure(print)(1) # prints "1"
But, we also need to think about other problems as well:

  1. Retries, with proper lazy IO one can retry an operation as many times as one wishes: p = impure_lazy(print)(1); p(); p() # prints "1" twice
  2. Semantical identity to Future, currently it is not similar to regular IO, because Futures are lazy: they don't run until they are executed properly
  3. New users will find the similar data-type they already know from other languages / libraries

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