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Faster readStr() (#14099)

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* Faster readStr()

* https://github.com/nim-lang/Nim/issues/13857

* Add .since annotation and add to changelog

* Private, un-sinced proc for csource bootstrapping
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Christopher Dunn 2020-04-25 13:19:11 -05:00 • committed by GitHub
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@ -37,6 +37,9 @@
and this can now throw in edge cases where `getCurrentDir` throws.
`relativePath` also now works for js with `-d:nodejs`.
- Added `streams.readStr` and `streams.peekStr` overloads to
accept an existing string to modify, which avoids memory
allocations, similar to `streams.readLine` (#13857).
## 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: