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## v0.20.0 - XX/XX/2018
### Changes affecting backwards compatibility
- The ``isLower``, ``isUpper`` family of procs in strutils/unicode
operating on **strings** have been
deprecated since it was unclear what these do. Note that the much more
useful procs that operator on ``char`` or ``Rune`` are not affected.
- `strutils.editDistance` has been deprecated,
use `editdistance.editDistance` or `editdistance.editDistanceAscii`
instead.
- The OpenMP parallel iterator \``||`\` now supports any `#pragma omp directives`
and not just `#pragma omp parallel for`. See
[OpenMP documentation](https://www.openmp.org/wp-content/uploads/OpenMP-4.5-1115-CPP-web.pdf).
The default annotation is `parallel for`, if you used OpenMP without annotation
the change is transparent, if you used annotations you will have to prefix
your previous annotations with `parallel for`.
- The `unchecked` pragma was removed, instead use `system.UncheckedArray`.
- The undocumented ``#? strongSpaces`` parsing mode has been removed.
- The `not` operator is now always a unary operator, this means that code like
``assert not isFalse(3)`` compiles.
#### Breaking changes in the standard library
- `osproc.execProcess` now also takes a `workingDir` parameter.
- `options.UnpackError` is no longer a ref type and inherits from `System.Defect` instead of `System.ValueError`.
#### Breaking changes in the compiler
- The compiler now implements the "generic symbol prepass" for `when` statements
in generics, see bug #8603. This means that code like this does not compile
anymore:
```nim
proc enumToString*(enums: openArray[enum]): string =
# typo: 'e' instead 'enums'
when e.low.ord >= 0 and e.high.ord < 256:
result = newString(enums.len)
else:
result = newString(enums.len * 2)
```
- ``discard x`` is now illegal when `x` is a function symbol.
### Library additions
- There is a new stdlib module `std/editdistance` as a replacement for the
deprecated `strutils.editDistance`.
- There is a new stdlib module `std/wordwrap` as a replacement for the
deprecated `strutils.wordwrap`.
- Added `split`, `splitWhitespace`, `size`, `alignLeft`, `align`,
`strip`, `repeat` procs and iterators to `unicode.nim`.
- Added `or` for `NimNode` in `macros`.
- Added `system.typeof` for more control over how `type` expressions
can be deduced.
- Added `macros.isInstantiationOf` for checking if the proc symbol
is instantiation of generic proc symbol.
### Library changes
- The string output of `macros.lispRepr` proc has been tweaked
slightly. The `dumpLisp` macro in this module now outputs an
indented proper Lisp, devoid of commas.
- In `strutils` empty strings now no longer matched as substrings
anymore.
- Complex type is now generic and not a tuple anymore.
- The `ospaths` module is now deprecated, use `os` instead. Note that
`os` is available in a NimScript environment but unsupported
operations produce a compile-time error.
- The `parseopt` module now supports a new flag `allowWhitespaceAfterColon`
(default value: true) that can be set to `false` for better Posix
interoperability. (Bug #9619.)
### Language additions
- Vm suport for float32<->int32 and float64<->int64 casts was added.
- There is a new pragma block `noSideEffect` that works like
the `gcsafe` pragma block.
- added os.getCurrentProcessId()
### Language changes
- The standard extension for SCF (source code filters) files was changed from
``.tmpl`` to ``.nimf``,
it's more recognizable and allows tools like github to recognize it as Nim,
see [#9647](https://github.com/nim-lang/Nim/issues/9647).
The previous extension will continue to work.
### Tool changes
- `jsondoc` now include a `moduleDescription` field with the module
description. `jsondoc0` shows comments as it's own objects as shown in the
documentation.
### Compiler changes
- The deprecated `fmod` proc is now unavailable on the VM'.
### Bugfixes
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