• My issue is not bikeshedding. (we can bikeshed at
  a later proposal stage)
• My issue is not a request to add lots of stuff to
  the semantics. (we can add things in follow-on proposals)
• My issue is appropriate for a stage 0 proposal

With TS 3.4 it became common practice to create tuples with [a, b, c] as const. This is really convenient, however the resulting tuple is readonly. It would be awesome to add support for these readonly tuples, right now I get error readonly (something) is not assignable to any[].