[Python-Dev] Should PEP 498 specify if rf'...' is valid?

It mentions fr'...' as a formatted raw string but doesn't say anything about rf'...'. Right now, in implementing PEP 498 support in Howl (https://github.com/howl-editor/howl/pull/118 and https://github.com/howl-editor/howl/commit/1e577da89efc1c1de780634b531f64346...), I assumed both were valid. Should the PEP be more specific? BTW, at the rate language-python is going, GitHub will get syntax highlighting for f-strings in 2050. :D -- Sent from my Nexus 5 with K-9 Mail. Please excuse my brevity.