Custom filters can now be registered with wildcard attributes, for
example filter=*. Consumers should examine the attributes parameter
of the check function for details.
Symlinks are now followed when locking a file, which can be
necessary when multiple worktrees share a base repository.
You can now set your own user-agent to be sent for HTTP requests by
using the GIT_OPT_SET_USER_AGENT with git_libgit2_opts().
You can set custom HTTP header fields to be sent along with requests
by passing them in the fetch and push options.
Tree objects are now assumed to be sorted. If a tree is not
correctly formed, it will give bad results. This is the git approach
and cuts a significant amount of time when reading the trees.
Filter registration is now protected against concurrent
registration.
Filenames which are not valid on Windows in an index no longer cause
to fail to parse it on that OS.
Rebases can now be performed purely in-memory, without touching the
repository's workdir.
When adding objects to the index, or when creating new tree or commit
objects, the inputs are validated to ensure that the dependent objects
exist and are of the correct type. This object validation can be
disabled with the GIT_OPT_ENABLE_STRICT_OBJECT_CREATION option.
The WinHTTP transport's handling of bad credentials now behaves like
the others, asking for credentials again.