[mullr]

Emacs 27 includes a native JSON parser (as opposed to one written in elisp, used previously). This matters a lot if you're using `lsp-mode`, since the LSP protocol uses a JSON encoding. I've been using local builds of emacs 27 for quite some time, for this very reason.

[imglorp]

How long until lsp-mode starts to support the native json parser?

[mullr]

It already does.

[jlokier]

Emacs has supported loadable C modules for a while, so I'm surprised there isn't a loadable native JSON parser for pre-27 Emacs already.

[OhSoHumble]

Ligatures support comes in 27 as well.