Set VERSION to 1.10.0-DEV (#47222)

* Set VERSION to 1.10.0-DEV

* move NEWS over to HISTORY

HISTORY.md

@@ -1,3 +1,250 @@
+Julia v1.9 Release Notes
+========================
+
+New language features
+---------------------
+
+* It is now possible to assign to bindings in another module using `setproperty!(::Module, ::Symbol, x)` ([#44137]).
+* Slurping in assignments is now also allowed in non-final position. This is handled via `Base.split_rest` ([#42902]).
+* Character literals now support the same syntax allowed in string literals; i.e. the syntax can
+  represent invalid UTF-8 sequences as allowed by the `Char` type ([#44989]).
+* Support for Unicode 15 ([#47392]).
+* Nested combinations of tuples and named tuples of symbols are now allowed as type parameters ([#46300]).
+* New builtins `getglobal(::Module, ::Symbol[, order])` and `setglobal!(::Module, ::Symbol, x[, order])`
+  for reading from and writing to globals. `getglobal` should now be preferred for accessing globals over
+  `getfield` ([#44137]).
+
+Language changes
+----------------
+
+* The `@invoke` macro introduced in 1.7 is now exported. Additionally, it now uses `Core.Typeof(x)`
+  rather than `Any` when a type annotation is omitted for an argument `x` so that types passed
+  as arguments are handled correctly ([#45807]).
+* The `invokelatest` function and `@invokelatest` macro introduced in 1.7 are now exported ([#45831]).
+
+Compiler/Runtime improvements
+-----------------------------
+
+* The known quadratic behavior of type inference is now fixed and inference uses less memory in general.
+  Certain edge cases with auto-generated long functions (e.g. ModelingToolkit.jl with partial
+  differential equations and large causal models) should see significant compile-time improvements ([#45276], [#45404]).
+* Non-concrete call sites can now be union-split to be inlined or statically resolved even
+  if there are multiple dispatch candidates. This may improve runtime performance in certain
+  situations where object types are not fully known statically, by statically resolving
+  `@nospecialize`-d call sites and avoiding excessive compilation ([#44512]).
+* All uses of the `@pure` macro in `Base` have been replaced with the now-preferred `Base.@assume_effects` ([#44776]).
+* `invoke(f, invokesig, args...)` calls to a less-specific method than would normally be chosen
+  for `f(args...)` are no longer spuriously invalidated when loading package precompile files ([#46010]).
+
+Command-line option changes
+---------------------------
+
+* In Linux and Windows, `--threads=auto` now tries to infer the usable number of CPUs from the
+  process affinity which is set typically in HPC and cloud environments ([#42340]).
+* `--math-mode=fast` is now a no-op ([#41638]). Users are encouraged to use the @fastmath macro instead, which has more well-defined semantics.
+* The `--threads` command-line option now accepts `auto|N[,auto|M]` where `M` specifies the
+  number of interactive threads to create (`auto` currently means 1) ([#42302]).
+* New option `--heap-size-hint=<size>` suggests a size limit to invoke garbage collection more eagerly.
+  The size may be specified in bytes, kilobytes (1000k), megabytes (300M), or gigabytes (1.5G) ([#45369]).
+
+Multi-threading changes
+-----------------------
+
+* `Threads.@spawn` now accepts an optional first argument: `:default` or `:interactive`.
+  An interactive task desires low latency and implicitly agrees to be short duration or to yield frequently.
+  Interactive tasks will run on interactive threads, if any are specified when Julia is started ([#42302]).
+* Threads started outside the Julia runtime (e.g. from C or Java) can now become able to call into Julia code
+  by calling `jl_adopt_thread`. This is done automatically when entering Julia code via `cfunction` or a
+  `@ccallable` entry point. As a consequence, the number of threads can now change during execution ([#46609]).
+
+Build system changes
+--------------------
+
+
+New library functions
+---------------------
+
+* New function `Iterators.flatmap` ([#44792]).
+* New helper `Splat(f)` which acts like `x -> f(x...)`, with pretty printing for
+  inspecting which function `f` was originally wrapped ([#42717]).
+* New `pkgversion(m::Module)` function to get the version of the package that loaded
+  a given module, similar to `pkgdir(m::Module)` ([#45607]).
+* New function `stack(x)` which generalises `reduce(hcat, x::Vector{<:Vector})` to any dimensionality,
+  and allows any iterator of iterators. Method `stack(f, x)` generalises `mapreduce(f, hcat, x)` and
+  is more efficient ([#43334]).
+* New macro `@allocations` which is similar to `@allocated` except reporting the total number of allocations
+  rather than the total size of memory allocated ([#47367]).
+
+New library features
+--------------------
+
+* `RoundFromZero` now works for non-`BigFloat` types ([#41246]).
+* `Dict` can be now shrunk manually by `sizehint!` ([#45004]).
+* `@time` now separates out % time spent recompiling invalidated methods ([#45015]).
+
+Standard library changes
+------------------------
+
+* A known concurrency issue in `iterate` methods on `Dict` and other derived objects such
+  as `keys(::Dict)`, `values(::Dict)`, and `Set` is fixed. These methods of `iterate` can
+  now be called on a dictionary or set shared by arbitrary tasks provided that there are no
+  tasks mutating the dictionary or set ([#44534]).
+* Predicate function negation `!f` now returns a composed function `(!) ∘ f` instead of an anonymous function ([#44752]).
+* `eachslice` now works over multiple dimensions; `eachslice`, `eachrow` and `eachcol` return
+  a `Slices` object, which allows dispatching to provide more efficient methods ([#32310]).
+* `@kwdef` is now exported and added to the public API ([#46273]).
+* An issue with order of operations in `fld1` is now fixed ([#28973]).
+* Sorting is now always stable by default, as `QuickSort` was stabilized ([#45222]).
+
+#### Package Manager
+
+#### LinearAlgebra
+
+* The methods `a / b` and `b \ a` with `a` a scalar and `b` a vector, which were equivalent to `a * pinv(b)`,
+  have been removed due to the risk of confusion with elementwise division ([#44358]).
+* We are now wholly reliant on libblastrampoline (LBT) for calling BLAS and LAPACK. OpenBLAS is shipped by default,
+  but building the system image with other BLAS/LAPACK libraries is not supported. Instead, it is recommended that
+  the LBT mechanism be used for swapping BLAS/LAPACK with vendor provided ones ([#44360]).
+* `lu` supports a new pivoting strategy `RowNonZero()` that chooses the first non-zero pivot element, for use with
+  new arithmetic types and for pedagogy ([#44571]).
+* `normalize(x, p=2)` now supports any normed vector space `x`, including scalars ([#44925]).
+* The default number of BLAS threads is now set to the number of CPU threads on ARM CPUs, and half the number
+  of CPU threads on other architectures ([#45412], [#46085]).
+
+#### Printf
+
+* Error messages for bad format strings have been improved, to make it clearer what and where in the
+  format string is wrong ([#45366]).
+
+#### Profile
+
+* New function `Profile.take_heap_snapshot(file)` that writes a file in Chrome's JSON-based `.heapsnapshot`
+  format ([#46862]).
+
+#### Random
+
+* `randn` and `randexp` now work for any `AbstractFloat` type defining `rand` ([#44714]).
+
+#### REPL
+
+* `Alt-e` now opens the current input in an editor. The content (if modified) will be executed
+  upon exiting the editor ([#33759]).
+* The contextual module which is active in the REPL can be changed (it is `Main` by default),
+  via the `REPL.activate(::Module)` function or via typing the module in the REPL and pressing
+  the keybinding Alt-m ([#33872]).
+* An "IPython mode" which mimics the behaviour of the prompts and storing the evaluated result in `Out` can be
+  activated with `REPL.ipython_mode!()`. See the manual for how to enable this at startup ([#46474]).
+
+#### SuiteSparse
+
+* Code for the SuiteSparse solver wrappers has been moved to SparseArrays.jl. Solvers are now re-exported by
+  SuiteSparse.jl.
+
+#### SparseArrays
+
+* SuiteSparse solvers are now available as submodules of SparseArrays (<https://github.com/JuliaSparse/SparseArrays.jl/pull/95>).
+* UMFPACK (<https://github.com/JuliaSparse/SparseArrays.jl/pull/179>) and CHOLMOD (<https://github.com/JuliaSparse/SparseArrays.jl/pull/206>) thread safety are improved by
+  avoiding globals and using locks. Multithreaded `ldiv!` of UMFPACK objects may now be performed safely.
+* An experimental function `SparseArrays.allowscalar(::Bool)` allows scalar indexing of sparse arrays to be
+  disabled or enabled. This function is intended to help find accidental scalar indexing of `SparseMatrixCSC`
+  objects, which is a common source of performance issues (<https://github.com/JuliaSparse/SparseArrays.jl/pull/200>).
+
+#### Test
+
+* New fail-fast mode for testsets that will terminate the test run early if a failure or error occurs.
+  Set either via the `@testset` kwarg `failfast=true` or by setting env var `JULIA_TEST_FAILFAST`
+  to `"true"` i.e. in CI runs to request the job failure be posted eagerly when issues occur ([#45317])
+
+#### Dates
+
+* Empty strings are no longer incorrectly parsed as valid `DateTime`s, `Date`s or `Time`s and instead throw an
+  `ArgumentError` in constructors and `parse`, while `nothing` is returned by `tryparse` ([#47117]).
+
+#### Distributed
+
+* The package environment (active project, `LOAD_PATH`, `DEPOT_PATH`) is now propagated when adding *local* workers
+  (e.g. with `addprocs(N::Int)` or through the `--procs=N` command line flag) ([#43270]).
+* `addprocs` for local workers now accepts the `env` keyword argument for passing environment variables to worker
+  processes. This was already supported for remote workers ([#43270]).
+
+#### Unicode
+
+* `graphemes(s, m:n)` returns a substring of the `m`-th to `n`-th graphemes in `s` ([#44266]).
+
+#### DelimitedFiles
+
+* DelimitedFiles has been moved out as a separate package. It now has to be explicitly installed to be used.
+
+Deprecated or removed
+---------------------
+
+* Unexported `splat` is deprecated in favor of exported `Splat`, which has pretty printing of the wrapped function ([#42717]).
+
+External dependencies
+---------------------
+
+* On Linux, now autodetects the system libstdc++ version, and automatically loads the system library if it is newer.
+  The old behavior of loading the bundled libstdc++ regardless of the system version can be restored by setting the
+  environment variable `JULIA_PROBE_LIBSTDCXX=0` ([#46976]).
+* Removed `RPATH` from the julia binary. On Linux this may break libraries that have failed to set `RUNPATH`.
+
+Tooling Improvements
+--------------------
+
+* Printing of `MethodError` and methods (such as from `methods(my_func)`) is now prettified and colored consistently
+  with printing of methods in stacktraces ([#45069]).
+
+<!--- generated by NEWS-update.jl: -->
+[#28973]: https://github.com/JuliaLang/julia/issues/28973
+[#32310]: https://github.com/JuliaLang/julia/issues/32310
+[#33759]: https://github.com/JuliaLang/julia/issues/33759
+[#33872]: https://github.com/JuliaLang/julia/issues/33872
+[#41246]: https://github.com/JuliaLang/julia/issues/41246
+[#41638]: https://github.com/JuliaLang/julia/issues/41638
+[#42302]: https://github.com/JuliaLang/julia/issues/42302
+[#42340]: https://github.com/JuliaLang/julia/issues/42340
+[#42717]: https://github.com/JuliaLang/julia/issues/42717
+[#42902]: https://github.com/JuliaLang/julia/issues/42902
+[#43270]: https://github.com/JuliaLang/julia/issues/43270
+[#43334]: https://github.com/JuliaLang/julia/issues/43334
+[#44137]: https://github.com/JuliaLang/julia/issues/44137
+[#44266]: https://github.com/JuliaLang/julia/issues/44266
+[#44358]: https://github.com/JuliaLang/julia/issues/44358
+[#44360]: https://github.com/JuliaLang/julia/issues/44360
+[#44512]: https://github.com/JuliaLang/julia/issues/44512
+[#44534]: https://github.com/JuliaLang/julia/issues/44534
+[#44571]: https://github.com/JuliaLang/julia/issues/44571
+[#44714]: https://github.com/JuliaLang/julia/issues/44714
+[#44752]: https://github.com/JuliaLang/julia/issues/44752
+[#44776]: https://github.com/JuliaLang/julia/issues/44776
+[#44792]: https://github.com/JuliaLang/julia/issues/44792
+[#44925]: https://github.com/JuliaLang/julia/issues/44925
+[#44989]: https://github.com/JuliaLang/julia/issues/44989
+[#45004]: https://github.com/JuliaLang/julia/issues/45004
+[#45015]: https://github.com/JuliaLang/julia/issues/45015
+[#45069]: https://github.com/JuliaLang/julia/issues/45069
+[#45222]: https://github.com/JuliaLang/julia/issues/45222
+[#45276]: https://github.com/JuliaLang/julia/issues/45276
+[#45317]: https://github.com/JuliaLang/julia/issues/45317
+[#45366]: https://github.com/JuliaLang/julia/issues/45366
+[#45369]: https://github.com/JuliaLang/julia/issues/45369
+[#45404]: https://github.com/JuliaLang/julia/issues/45404
+[#45412]: https://github.com/JuliaLang/julia/issues/45412
+[#45607]: https://github.com/JuliaLang/julia/issues/45607
+[#45807]: https://github.com/JuliaLang/julia/issues/45807
+[#45831]: https://github.com/JuliaLang/julia/issues/45831
+[#46010]: https://github.com/JuliaLang/julia/issues/46010
+[#46085]: https://github.com/JuliaLang/julia/issues/46085
+[#46273]: https://github.com/JuliaLang/julia/issues/46273
+[#46300]: https://github.com/JuliaLang/julia/issues/46300
+[#46474]: https://github.com/JuliaLang/julia/issues/46474
+[#46609]: https://github.com/JuliaLang/julia/issues/46609
+[#46862]: https://github.com/JuliaLang/julia/issues/46862
+[#46976]: https://github.com/JuliaLang/julia/issues/46976
+[#47367]: https://github.com/JuliaLang/julia/issues/47367
+[#47392]: https://github.com/JuliaLang/julia/issues/47392
+
+
 Julia v1.8 Release Notes
 ========================