RDF 1.1 still valid under all circumstances?

Hi,

I am developing a new RDF framework for Rust applications, and
maintaining RDF 1.2 features behind a feature gate is becoming more and
more cumbersome.

The WG charter states:

> The group SHOULD ensure that any RDF 1.1 data remains valid in this new
> version. Furthermore, any RDF or RDFS entailment drawn under RDF 1.1
> semantics SHOULD also remain valid in this new version.

So, has the group succeeded in doing so? Can I safely enable RDF 1.2 by
default i nall code that consumes RDF data?

(Obviously, I can't assume RDF 1.2 compatibility when *emitting* RDF
data.)

Cheers,
Nik