pre-RFC: Leading commas

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.

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