add option to disable rocksdb checksums

reference runtime state for default option initialization

Signed-off-by: Jason Volk <jason@zemos.net>

src/database/map/keys_from.rs

@@ -53,7 +53,7 @@ where
 {
 	use crate::pool::Seek;
 
-	let opts = super::iter_options_default();
+	let opts = super::iter_options_default(&self.db);
 	let state = stream::State::new(self, opts);
 	if is_cached(self, from) {
 		return stream::Keys::<'_>::from(state.init_fwd(from.as_ref().into())).boxed();