Glen Whitney 22a12567f8 feat: implement symbolicEqual function
Note for this to work in a broad variety of contexts, has to also allow
  identical expressions to cancel regardless of whether subtraction is
  always defined; but this seems safe in general, that x-x is 0 even if x
  does not generally have an additive inverse (for example, when working
  in the positive context).

  Resolves #1260.
2022-02-16 17:34:26 -08:00
..