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changelog: 0.1.27

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CHANGELOG.md
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## V 0.1.27
*5 May 2020*
- vfmt has been re-written from scratch using the new AST parser. It's much faster, cleaner, and can format
files with compilation errors.
- `strconv, `sprintf`, and `printf` in native V, without any libc calls.
- Interfaces are now a lot more stable and have all expected features.
- Lots of x64 backend improvements: function calls, if expressions, for loops, local variables.
- `map()` and `filter()` methods can now be chained.
- New `[]int{cap:cap, len:len}` syntax for initializing array length and capacity.
- New `is` keyword for checking the type of sum types and interfaces.
- `as` can now be used to cast interfaces and sum types.
- Profiling with `-profile`. Prints a nice table with detailed information about every single function call:
number of calls, average time per call, total time per function.
- `import(xxx)` syntax has been removed in favor of `import xxx` for simplicity and greppability.
- Lots of fixes and improvements in the type checker.
- `time.StopWatch`
- `dl` module for dynamic loading.
- Automatic `str()` method generation for every single type, including all arrays and fixed size arrays.
- Short struct initialization syntax for imitating named function args: `foo(bar:0, baz:1)`.
- New operator `!in`.
- Performance improvements in critical parts of the builtin data structures (array, map).
- High order functions improvements (functions can now be returned etc).
- Anonymous functions that can be defined inside other functions.
- Built-in JSON module is back.
- Closures.
- Lots and lots of new tests added, including output tests that test error messages.
- Multiple errors are now printed, the compiler no longer stops after the first error.
- Thew new JS backend using the AST parser (almost complete).
- Variadic functions.
- `net.websocket` module (early stage).
- `vlib` is now memory leak free, lots of `autofree` improvements.
- Simplified and cleaned up `cmd/v`, `v.builder`.
## V 0.1.25
*1 Apr 2020*
- The entire compiler has been re-written with an AST parser. The code is now a lot cleaner and more maintainable. ~15k lines of old compiler code were removed.