* The new `math' library provides functions and data structures for
working with numbers and collections of numbers. Functions include
non-elementary (such as gamma, zeta, Lambert's W), number-theoretic
(factorization, modular arithmetic), linear algebra (arithmetic,
decompositions), and statistical (expected values, order statistics,
binning). Data structures include arbitrary-precision bigfloats,
probability distributions, and multidimensional arrays.
* The new `file/untar', `file/untgz', and `file/unzip' libraries support
unpacking widely used archive formats.
* The new `lazy-require' form allows programs to delay the loading and
instantiation of helper modules until they are needed.
* The new `data/bit-vector' library provides an implementation of bit
vectors (a mutable sequence of booleans) supporting popcount.
* The `racket/generic' library allows the specification of default
method implementations for core datatypes.
* The `openssl' library can verify hostnames and use the operating
system's certificate store to verify certificates.
* A new package system is in beta release. This system will become
Planet's successor. It differs significantly from the latter. For
details, please read the documentation at
http://docs.racket-lang.org/planet2/ and list your packages on the new
index at https://pkg.racket-lang.org/.
* The `raco test' command supports testing by collection and package, in
addition to by directory and file, with the "-c" and "-p" options.
* batch-io: the read and write functions work on Unix-style standard
input and output.
* DrRacket's GUI is more responsive.
* The automatic parenthesis insertion mode is improved.
* Scribble renders Markdown format files via the "--markdown"
command-line flag. Example use case: Generate documentation hosted on
GitHub or BitBucket.
* Documentation cross-reference information is stored in an SQLite3
database, which means that SQLite3 is required for building Racket
documentation on Unix/Linux machines (but SQLite3 is included in
Racket distributions for Windows and Mac OS X).
Using a database for cross-reference information significantly reduces
the initial footprint of DrRacket, since DrRacket no longer needs to
load all cross-reference information.
* Typed Racket programs can require `plot/typed' to draw plots. List-
and vector-accepting functions accept general sequences.
* Typed Racket supports Racket's delimited continuation and continuation
* Added more support for `define-judgment-form', including random
generation for well-formed judgments and visualization of judgments.
The following have been removed in this release:
* the `planet' command-line tool; use `raco planet' instead.
The following has been deprecated and will be removed in the August 2013
* the `mzlib/class100' library; use `racket/class' instead.