Based on my experiments, I added this to the docs (not pushed until I'm ready to stop work). Let me know if it's not true:
uccello:~/plt/collects/scribblings/foreign clements$ git diff cvector.scrbl
diff --git a/collects/scribblings/foreign/cvector.scrbl
b/collects/scribblings/foreign/cvector.scrbl
index 750989d..6c4f2a6 100644
--- a/collects/scribblings/foreign/cvector.scrbl
+++ b/collects/scribblings/foreign/cvector.scrbl
@@ -25,7 +25,8 @@ needed.}
@defproc[(make-cvector [type ctype?] [length exact-nonnegative-integer?])
cvector?]{
Allocates a C vector using the given @scheme[type] and
-...@scheme[length].}
+...@scheme[length]. The resulting vector is not guaranteed to
+contain any particular values.}
@defproc[(cvector [type ctype?] [val any/c] ...) cvector?]{
smime.p7s
Description: S/MIME cryptographic signature
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