With the release of Python 3.14, t-strings (PEP 750) seem well suited to markupsafe e.g.

Markup(t'foo {bar} baz')

should be similar to

Markup("foo %s baz") % bar

possibly easier to lint and typecheck.

While it would work nicely by just adding __html__ to string.templatelib.Template, that is not an option:

>>> Template.__html__ = None
...
TypeError: cannot set '__html__' attribute of immutable type 'string.templatelib.Template'

so sadly in order for this to work markupsafe needs dedicated support.

Open question: should escape(t'foo {bar} baz') behave the same as Markup(t'foo {bar} baz')? That would parallel the __html__ protocol, which I think is reasonable.

I'd be glad to contribute this, I already have the start of an implementation.