variable.c: first iv allocation size should be 4 instead of 1.
MODIFY
src/variable.c
src/variable.c
@@ -39,7 +39,7 @@ static void
iv_rehash(mrb_state *mrb, iv_tbl *t)
{
size_t old_alloc = t->alloc;
- size_t new_alloc = old_alloc+1;
+ size_t new_alloc = old_alloc+4;
mrb_value *old_ptr = t->ptr;
khash_power2(new_alloc);

variable.c: first iv allocation size should be 4 instead of 1.