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# v0.20.2 - 2019-07-17
## Changes affecting backwards compatibility
- All `strutils.rfind` procs now take `start` and `last` like `strutils.find`
with the same data slice/index meaning. This is backwards compatible for
calls *not* changing the `rfind` `start` parameter from its default. (#11487)
In the unlikely case that you were using `rfind X, start=N`, or `rfind X, N`,
then you need to change that to `rfind X, last=N` or `rfind X, 0, N`. (This
should minimize gotchas porting code from other languages like Python or C++.)
- On Windows stderr/stdout/stdin are not opened as binary files anymore. Use the switch
`-d:nimBinaryStdFiles` for a transition period.
### Breaking changes in the standard library
- Mac OS X / BSD: TSa_Family is now the ``uint8`` type, so type
conversions like ``x.sin_family = uint16 toInt(nativesockets.AF_INET)``
need to be changed into ``x.sin_family = TSa_Family toInt(nativesockets.AF_INET)``.
### Breaking changes in the compiler
## Library additions
- `toOpenArray` is now available for the JS target.
## Library changes
- Fix async IO operations stalling even after socket is closed. (#11232)
- More informative error message for `streams.openFileStream`. (#11438)
## Language additions
## Language changes
### Tool changes
### Compiler changes
- Better error message for IndexError for empty containers. (#11476)
- Fix regression in semfold for old right shift. (#11477)
- Fix for passing tuples as static params to macros. (#11423)
## Bugfixes
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