I'm pleased to announce the release of pandoc 2.10,
available in the usual places:

Binary packages & changelog:
https://github.com/jgm/pandoc/releases/tag/2.10

Source & API documentation:
http://hackage.haskell.org/package/pandoc-2.10

Some highlights:

* Pandoc can now be compiled with ghc 8.10.

* A native Underline constructor for Inline (#6277, Vaibhav Sagar)
and more consistent treatment of underlined text in readers
and writers.

* More expressive types for tables (#1024, Christian Despres).
Tables can now take attributes; and rowspans and colspans,
column headers, multiple row headers, table head and foot
can all be represented. (Note, however, that reader and
writer support for these features is still lacking, so
most users won't see any differences in table conversion
yet. These changes just lay the foundation for further
improvements.)

* Templates can now use the pipes `first`, `rest`, `last`, and
`allbutlast` on arrays.

* A new `--no-check-certificate` option to disable certificate
validation when resources are fetched by HTTP (#6156, Cédric Couralet,
Cécile Chemin, Juliette Fourcot).

* Boolean fields now work in metadata within defaults files
(Nikolay Yakimov, #6328).

* The `implicit_figures` extension now works with commonmark
and gfm (#6350).

* We now target version 4.x of reveal.js. File locations have
changed, so if you are using pandoc-produced reveal.js files
with a local copy of reveal.js, you will need to upgrade.

* epub.css has changed to wrap overlong lines in highlighted code
blocks (#6242). This fixes a problem in iBooks v2.4 with our earlier
horizontally scrolling code blocks. The problem seems to
be a bug in iBooks, not pandoc, but since iBooks is a major
target we're changing pandoc's default behavior so that
pandoc-produced epubs work on that platform.

* Many other bug fixes and small improvements (see the changelog
for details).

API changes:

* New Underline constructor for Inline and new Table types for Block.

* Use new type PandocLua for all pandoc Lua operations.

* Use PandocError for exceptions in Lua subsystem.

Thanks to everyone who contributed, and especially Christian Despres for
creating the new table types and modifying the whole code base to use it,
Vaibhav Sagar for implenting the Underline constructor, Mathieu Boespflug for
improving the DocBook reader, Joseph C. Sible for many code improvements and
some important fixes to Text.Pandoc.UUID, and Albert Krewinkel for work on the
lua subsystem, Jira reader and writer, Org reader and writer, and JATS reader.
Thanks, as well, to those who have raised issues, participated in discussions,
and helped to triage bugs.