diff --git a/src/combinations.rs b/src/combinations.rs
index f409775..d0ca8c9 100644
--- a/src/combinations.rs
+++ b/src/combinations.rs
@@ -144,8 +144,7 @@ where
     fn traverse(&self, thing: T) -> Vec<Self::Field> {
         let a = A::traverse(&self.0 .0, thing);
         a.into_iter()
-            .map(|v| B::traverse(&self.1 .0, v))
-            .flatten()
+            .flat_map(|v| B::traverse(&self.1 .0, v))
             .collect()
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index c320aa8..29c280a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,5 @@
 #![feature(unboxed_closures, fn_traits, const_trait_impl)]
+#![allow(clippy::type_complexity)]
 
 pub mod combinations;
 mod fns;
diff --git a/src/prisms/mod.rs b/src/prisms/mod.rs
index caeff7f..762d5c2 100644
--- a/src/prisms/mod.rs
+++ b/src/prisms/mod.rs
@@ -21,11 +21,7 @@ pub trait PrismPreview<T> {
         F: FnOnce(Self::Field) -> Self::Field,
         T: Clone,
     {
-        if let Some(a) = Self::preview(&self, thing.clone()) {
-            Self::review(&self, f(a))
-        } else {
-            thing
-        }
+        Self::preview(self, thing.clone()).map_or(thing, |a| Self::review(self, f(a)))
     }
 
     fn set(&self, thing: T, v: Self::Field) -> T
@@ -33,7 +29,7 @@ pub trait PrismPreview<T> {
         T: Clone,
         Self::Field: Clone,
     {
-        Self::over(self, thing, move |_| v.clone())
+        Self::over(self, thing, move |_| v)
     }
 }