Linking what I said last time: Grammar liberalizations - #6 by scottmcm
I see no good reason to do this (in contrast to the vert change), as this is a ton of churn and doesn't actually make any scenarios easier over just using what's already supported.
(Also, if this is accepted, I don't think it's just about commas, and should also allow trailing verts, leading +, etc as well.)
Not really; we just allow ; as short form for (); --- ;bar() ;bar() is different from bar(); bar(); in general.