First and foremost, I have added some patches that disable MPROTECT for
some Racket executables and fix PR pkg/53467.
As for changes since the latest version, 6.11, these include:
* Changed the way some unsafe operations are exposed via `ffi/unsafe`
libraries to help smooth a future transition to a new runtime system.
* The `syntax-parse` form supports unwinding side-effects when it
backtracks, both explicitly with `~undo` patterns and implicitly
with the built-in managed state (using `syntax-parse-state-ref`,
etc).
* The `db` library supports SCRAM-SHA-256 authentication for backends
running PostgreSQL 10 or later. Client support for SCRAM and other
SASL mechanisms is provided by the new `sasl` library.
* The `lazy-require-syntax` form supports lazy loading of macro
transformers. Note that the macros must obey certain implementation
constraints (see the `lazy-require-syntax` documentation).
* Typed Racket no longer enforces types like `(U String (Boxof String))`
with the `any/c` contract. This fixes a type soundness issue, but may
affect performance. Please submit a bug report if you find a program
that runs significantly slower on v6.12 than earlier versions.
* Typed Racket's type instantiation (`inst`) uses `Any` for omitted type
arguments, allowing APIs to add additional type variables to functions
without breaking existing programs.
* `for/fold` users can customize the final result of a loop's computation
using the `#:result` keyword.
* The `--deps` option to `raco test` tests the packages the argument
packages depends on, in addition to testing the packages themselves.
For example, `raco test -p --deps pkg1 pkg2` tests all files from
`pkg1`, `pkg2`, and all of their dependencies.
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