Hello world,

I just now realized that our rule:

{e} -> e

Means that in practice, {} is "just for grouping", the way () in other
languages is used for grouping.

So, nested {} around single forms doesn't change the iconic meaning of
the underlying data structures.

Consider the C:

  ((a) + (b))

and the Scheme+SRFI-105:

  {{a} + {b}} ==> (+ a b)

I'll probably add that to the rationale soon.

Sincerely,
AmkG