Fix parameter types for rb_ivar_foreach() callbacks

For this public API, the callback is declared to take
`(ID, VALUE, st_data_t)`, but it so happens that using
`(st_data_t, st_data_t, st_data_t)` also
type checks, because the underlying type is identical.
Use it as declared and get rid of some casts.

1 files changed, 1 insertions, 3 deletions

diff --git a/object.c b/object.c
index a8090d0763..2bcfbc4c3c 100644
--- a/object.c
+++ b/object.c
@@ -702,10 +702,8 @@ rb_inspect(VALUE obj)
 }
 
 static int
-inspect_i(st_data_t k, st_data_t v, st_data_t a)
+inspect_i(ID id, VALUE value, st_data_t a)
 {
-    ID id = (ID)k;
-    VALUE value = (VALUE)v;
     VALUE str = (VALUE)a;
 
     /* need not to show internal data */