diff --git a/Cargo.toml b/Cargo.toml
index 574c3c8763..4877d9eea2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,3 +14,4 @@ xxhash-rust = { version = "0.8.0-beta.4", features = ["xxh3"] } # xxh3 hashing f
 thiserror = "1.0" # A nicer way to write Errors
 hashbrown = "0.9" # A faster hashmap, nostd compatible
 libc = "0.2" # For (*nix) libc
+num = "*"
\ No newline at end of file
diff --git a/src/feedbacks/mod.rs b/src/feedbacks/mod.rs
index 6b95341a04..2266de71fa 100644
--- a/src/feedbacks/mod.rs
+++ b/src/feedbacks/mod.rs
@@ -1,19 +1,22 @@
+extern crate num;
+
 use crate::corpus::Testcase;
 use crate::executors::Executor;
 use crate::observers::MapObserver;
 
+use num::Integer;
+
 pub trait Feedback {
     /// is_interesting should return the "Interestingness" from 0 to 255 (percent times 2.55)
     fn is_interesting(&mut self, executor: &dyn Executor, entry: &dyn Testcase) -> u8;
 }
 
-use crate::observers::StaticMapObserver;
-pub struct CovFeedback<'a> {
-    virgin_bits: Vec<u8>,
-    smo: &'a StaticMapObserver,
+pub struct CovFeedback<'a, MapT: Integer + Copy> {
+    virgin_bits: Vec<MapT>,
+    smo: &'a MapObserver<'a, MapT>,
 }
 
-impl<'a> Feedback for CovFeedback<'a> {
+impl<'a, MapT: Integer + Copy> Feedback for CovFeedback<'a, MapT> {
     fn is_interesting(&mut self, _executor: &dyn Executor, _entry: &dyn Testcase) -> u8 {
         let mut interesting = 0;
         // TODO: impl. correctly, optimize
@@ -30,12 +33,12 @@ impl<'a> Feedback for CovFeedback<'a> {
     }
 }
 
-impl<'a> CovFeedback<'a> {
+impl<'a, MapT: Integer + Copy> CovFeedback<'a, MapT> {
     /// Create new CovFeedback using a static map observer
-    pub fn new(smo: &'a StaticMapObserver) -> Self {
+    pub fn new(smo: &'a MapObserver<MapT>) -> Self {
         CovFeedback {
             smo: smo,
-            virgin_bits: vec![0; smo.get_map().len()],
+            virgin_bits: vec![MapT::zero(); smo.get_map().len()],
         }
     }
 }
diff --git a/src/observers/mod.rs b/src/observers/mod.rs
index b5a271234f..69e66486fc 100644
--- a/src/observers/mod.rs
+++ b/src/observers/mod.rs
@@ -1,6 +1,10 @@
+extern crate num;
+
 use crate::AflError;
 use std::slice::from_raw_parts_mut;
 
+use num::Integer;
+
 /// Observers observe different information about the target.
 /// They can then be used by various sorts of feedback.
 pub trait Observer {
@@ -15,42 +19,36 @@ pub trait Observer {
     }
 }
 
-/// A MapObserver contains a map with values, collected from the child.
-pub trait MapObserver<MapT>: Observer {
-    fn get_map(&self) -> &[MapT];
-    fn get_map_mut(&mut self) -> &mut [MapT];
-}
-
 /// A staticMapObserver observes the static map, as oftentimes used for afl-like coverage information
-pub struct StaticMapObserver {
-    map: &'static mut [u8],
+pub struct MapObserver<'a, MapT: Integer + Copy> {
+    map: &'a mut [MapT],
 }
 
-impl Observer for StaticMapObserver {
+impl<'a, MapT: Integer + Copy> Observer for MapObserver<'a, MapT> {
     fn reset(&mut self) -> Result<(), AflError> {
         // Normal memset, see https://rust.godbolt.org/z/Trs5hv
         for i in self.map.iter_mut() {
-            *i = 0;
+            *i = MapT::zero();
         }
         Ok(())
     }
 }
 
-impl MapObserver<u8> for StaticMapObserver {
-    fn get_map(&self) -> &[u8] {
+impl<'a, MapT: Integer + Copy> MapObserver<'a, MapT> {
+    pub fn get_map(&self) -> &[MapT] {
         self.map
     }
 
-    fn get_map_mut(&mut self) -> &mut [u8] {
+    pub fn get_map_mut(&mut self) -> &mut [MapT] {
         self.map
     }
 }
 
-impl StaticMapObserver {
-    /// Creates a new StaticMapObserver from a raw pointer.
-    pub fn new(map_ptr: *mut u8, len: usize) -> Self {
+impl<'a, MapT: Integer + Copy> MapObserver<'a, MapT> {
+    /// Creates a new MapObserver from a raw pointer.
+    pub fn new(map_ptr: *mut MapT, len: usize) -> Self {
         unsafe {
-            StaticMapObserver {
+            MapObserver {
                 map: from_raw_parts_mut(map_ptr, len),
             }
         }