Undo char-name

Hello,

Is there a way to undefine character names defined with `char-name`? Or at =
least
keep them local to a module?

To avoid XY problem:
  I am writing an reader extension and a characters like #\(, #\[, #\{
  frequently appear inside case-statements. They are confusing my text edit=
or.
  Nothing I've came up with is satisfactory.

  - variables cannot cannot be used as data in case-statements
  - ASCII/Unicode representations hamper readability.
  - Character names defined with `char-name` leak outside my module.

I'm fairly new to CHICKEN so forgive me if I overlooked something obvious.

Cheers,
Hern=C3=A1n