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added high level sendTo and recvFrom to std/asyncnet (UDP functionality) (#14109)

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* added high level sendTo and recvFrom to std/asyncnet; tests were also added.

* add .since annotation, a changelog entry and fixed to standard library style guide.

* Improved asserts msgs and added notes for use with UDP sockets
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rockcavera 2020-04-26 05:16:10 -03:00 • committed by GitHub
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@ -41,6 +41,8 @@
accept an existing string to modify, which avoids memory
allocations, similar to `streams.readLine` (#13857).
- Added high-level `asyncnet.sendTo` and `asyncnet.recvFrom`. UDP functionality.
## Language changes
- In newruntime it is now allowed to assign discriminator field without restrictions as long as case object doesn't have custom destructor. Discriminator value doesn't have to be a constant either. If you have custom destructor for case object and you do want to freely assign discriminator fields, it is recommended to refactor object into 2 objects like this:
```nim