Type declarations and data validation utils?

[Artyom Bologov]

Hi y'all,

I've compiled a generic collection of data-checking macros (which I'm
consider contributing as SRFI), but I'm not satisfied with their
performance. Dave Thompson's blog post shows benefits from adding type
predicates before the code, but it seems that my approach of adding
assert-s to the start of the function is less effective and adds a lot
of performance overhead.

Thus the question: is there any way to declare types that Guile will
accept and act on? Especially if this way it exported for user to play
with. I haven't found any pointers in the manual, thus I'm asking it
here (I'm also asking it on the devel list because devs are more likely
to know the ins and outs of typing and maybe even able to act on it.)

Thanks,
--
Artyom Bologov
https://aartaka.me