> I'd also like to be able to specify my own braces to construct my own type as a shorthand, that'd be great DSL That's the purpose of readtables in Common Lis

> I'd also like to be able to specify my own braces to construct my own type as a shorthand, that'd be great DSL That's the purpose of readtables in Common Lisp, defining custom readers for converting external representation to internal ones.