mathematical expressions as creation arguments would be nice,
just like C-function calls, especially those including preceding
[myobj $1/2 $2+4], or
[myobj expr($1/3) 2].
... Further/Alternatively, it would be interesting to have a set
method, setting the dollar argument like a variable, or recreating
the abstraction / object with new arguments
[setarg 1 4(,
[recreate arg 1 2(,
or in the abstraction
[inlet $1] ...