diff --git a/CMakeLists.txt b/CMakeLists.txt
index 585f6c0b..633719bd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,22 +1,61 @@
 cmake_minimum_required(VERSION 3.12)
 project("unordered_dense"
-    VERSION 1.2.0
+    VERSION 1.3.0
     DESCRIPTION "A fast & densely stored hashmap and hashset based on robin-hood backward shift deletion"
     HOMEPAGE_URL "https://github.com/martinus/unordered_dense")
 
+include(GNUInstallDirs)
+
 # determine whether this is a standalone project or included by other projects
-set(_unordered_dense_is_included ON)
-if(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
-    set(_unordered_dense_is_included OFF)
+if(CMAKE_PROJECT_NAME STREQUAL PROJECT_NAME)
+    set(_unordered_dense_is_toplevel_project TRUE)
+else()
+    set(_unordered_dense_is_toplevel_project FALSE)
 endif()
 
-if(_unordered_dense_is_included)
-    add_library(unordered_dense INTERFACE)
-    add_library(unordered_dense::unordered_dense ALIAS unordered_dense)
-    target_compile_features(unordered_dense INTERFACE cxx_std_17)
-    target_include_directories(
-        unordered_dense
-        INTERFACE
-            $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
-            $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
+add_library(unordered_dense INTERFACE)
+add_library(unordered_dense::unordered_dense ALIAS unordered_dense)
+
+target_include_directories(
+    unordered_dense
+    INTERFACE
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
+        $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
+
+target_compile_features(unordered_dense INTERFACE cxx_std_17)
+
+if(_unordered_dense_is_toplevel_project)
+    # locations are provided by GNUInstallDirs
+    install(
+        TARGETS unordered_dense
+        EXPORT unordered_dense_Targets
+        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})
+
+    include(CMakePackageConfigHelpers)
+    write_basic_package_version_file(
+        "unordered_denseConfigVersion.cmake"
+        VERSION ${PROJECT_VERSION}
+        COMPATIBILITY SameMajorVersion)
+
+    configure_package_config_file(
+        "${PROJECT_SOURCE_DIR}/cmake/unordered_denseConfig.cmake.in"
+        "${PROJECT_BINARY_DIR}/unordered_denseConfig.cmake"
+        INSTALL_DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/unordered_dense/cmake)
+
+    install(
+        EXPORT unordered_dense_Targets
+        FILE unordered_denseTargets.cmake
+        NAMESPACE unordered_dense::
+        DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/unordered_dense/cmake)
+
+    install(
+        FILES "${PROJECT_BINARY_DIR}/unordered_denseConfig.cmake"
+        "${PROJECT_BINARY_DIR}/unordered_denseConfigVersion.cmake"
+        DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/unordered_dense/cmake)
+
+    install(
+        DIRECTORY ${PROJECT_SOURCE_DIR}/include/ankerl
+        DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
 endif()
diff --git a/README.md b/README.md
index 3ad457c9..6fdfec55 100644
--- a/README.md
+++ b/README.md
@@ -6,33 +6,120 @@
 [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/6220/badge)](https://bestpractices.coreinfrastructure.org/projects/6220)
 [![Sponsors](https://img.shields.io/github/sponsors/martinus?style=social)](https://github.com/sponsors/martinus)
 
-# №Ÿš€ ankerl::unordered_dense::{map, set}
+# №Ÿš€ ankerl::unordered_dense::{map, set} <!-- omit in toc -->
 
 A fast & densely stored hashmap and hashset based on robin-hood backward shift deletion.
 
-The classes `ankerl::unordered_dense::map` and `ankerl::unordered_dense::set` are (almost) drop-in replacements of `std::unordered_map` and `std::unordered_set`.
-While they don't have as strong iterator / reference stability guaranties, they are typically *much* faster. Here is a short summary of the properties:
+The classes `ankerl::unordered_dense::map` and `ankerl::unordered_dense::set` are (almost) drop-in replacements of `std::unordered_map` and `std::unordered_set`. While they don't have as strong iterator / reference stability guaranties, they are typically *much* faster. 
+
+- [1. Overview](#1-overview)
+- [2. Installation](#2-installation)
+  - [2.1. Installing using cmake](#21-installing-using-cmake)
+- [3. Extensions](#3-extensions)
+  - [3.1. Container API](#31-container-api)
+    - [3.1.1. `auto extract() && -> value_container_type`](#311-auto-extract----value_container_type)
+    - [3.1.2. `[[nodiscard]] auto values() const noexcept -> value_container_type const&`](#312-nodiscard-auto-values-const-noexcept---value_container_type-const)
+    - [3.1.3. `auto replace(value_container_type&& container)`](#313-auto-replacevalue_container_type-container)
+  - [3.2. Custom Container Types](#32-custom-container-types)
+  - [3.3. Custom Bucket Tyeps](#33-custom-bucket-tyeps)
+    - [3.3.1. `ankerl::unordered_dense::bucket_type::standard`](#331-ankerlunordered_densebucket_typestandard)
+    - [3.3.2. `ankerl::unordered_dense::bucket_type::big`](#332-ankerlunordered_densebucket_typebig)
+- [4. Design](#4-design)
+  - [4.1. Inserts](#41-inserts)
+  - [4.2. Lookups](#42-lookups)
+  - [4.3. Removals](#43-removals)
+
+## 1. Overview
+
+The chosen design has a few advantages over `std::unordered_map`: 
 
-
-## Advantages
 * Perfect iteration speed - Data is stored in a `std::vector`, all data is contiguous!
 * Very fast insertion & lookup speed, in the same ballpark as [`absl::flat_hash_map`](https://abseil.io/docs/cpp/guides/container`)
 * Low memory usage
 * Full support for `std::allocators`, and [polymorphic allocators](https://en.cppreference.com/w/cpp/memory/polymorphic_allocator). There are `ankerl::unordered_dense::pmr` typedefs available
-* Simple: single header with just a bit over 1000 lines of code, this is less than half of [robin-hood-hashing](https://github.com/martinus/robin-hood-hashing)
+* Customizeable storage type: with a template parameter you can e.g. switch from `std::vector` to `boost::interprocess::vector` or any other compatible random-access container.
+
+There's no free lunch, so there are a few disadvantages:
 
-## Disadvantages
 * Deletion speed is relatively slow. This needs two lookups: one for the element to delete, and one for the element that is moved onto the newly empty spot.
 * no `const Key` in `std::pair<Key, Value>`
 * Iterators are not stable on insert/erase
 
-## Design
+
+## 2. Installation
+
+<!-- See https://github.com/bernedom/SI/blob/main/doc/installation-guide.md -->
+The default installation location is `/usr/local`.
+
+### 2.1. Installing using cmake 
+
+Clone the repository and run these commands in the cloned folder:
+
+```sh
+mkdir build && cd build
+cmake ..
+cmake --build . --target install
+```
+
+Consider setting an install prefix if you do not want to install `unordered_dense` system wide, like so:
+
+```sh
+mkdir build && cd build
+cmake -DCMAKE_INSTALL_PREFIX:PATH=${HOME}/unordered_dense_install ..
+cmake --build . --target install
+```
+
+To make use of the installed library, add this to your project:
+
+```cmake
+find_package(unordered_dense CONFIG REQUIRED)
+target_link_libraries(your_project_name unordered_dense::unordered_dense)
+```
+
+## 3. Extensions
+
+### 3.1. Container API
+
+In addition to the standard `std::unordered_map` API (see https://en.cppreference.com/w/cpp/container/unordered_map) we have additional API leveraging the fact that we're using a random access container internally:
+
+#### 3.1.1. `auto extract() && -> value_container_type`
+
+Extracts the internally used container. `*this` is emptied.
+
+#### 3.1.2. `[[nodiscard]] auto values() const noexcept -> value_container_type const&`
+
+Exposes the underlying values container.
+
+#### 3.1.3. `auto replace(value_container_type&& container)`
+
+Discards the internally held container and replaces it with the one passed. Non-unique elements are
+removed, and the container will be partly reordered when non-unique elements are found.
+
+### 3.2. Custom Container Types
+
+`unordered_dense` accepts a custom allocator, but you can also specify a custom container for that template argument. That way it is possible to replace the internally used `std::vector` with e.g. `std::deque` or any other container like `boost::interprocess::vector`. This supports fancy pointers (e.g. [offset_ptr](https://www.boost.org/doc/libs/1_80_0/doc/html/interprocess/offset_ptr.html)), so the container can be used with e.g. shared memory provided by `boost::interprocess`.
+
+### 3.3. Custom Bucket Tyeps
+
+The map/set supports two different bucket types. The default should be good for pretty much everyone.
+
+#### 3.3.1. `ankerl::unordered_dense::bucket_type::standard`
+
+* Up to 2^32 = 4.29 billion elements.
+* 8 bytes overhead per bucket.
+
+#### 3.3.2. `ankerl::unordered_dense::bucket_type::big`
+
+* up to 2^63 = 9223372036854775808 elements.
+* 12 bytes overhead per bucket.
+
+## 4. Design
 
 The map/set has two data structures:
 * `std::vector<value_type>` which holds all data. map/set iterators are just `std::vector<value_type>::iterator`!
 * An indexing structure (bucket array), which is a flat array with 8-byte buckets.
 
-### Inserts
+### 4.1. Inserts
 
 Whenever an element is added it is `emplace_back` to the vector. The key is hashed, and an entry (bucket) is added at the
 corresponding location in the bucket array. The bucket has this structure:
@@ -52,12 +139,12 @@ Each bucket stores 3 things:
 This structure is especially designed for the collision resolution strategy robin-hood hashing with backward shift
 deletion.
 
-### Lookups
+### 4.2. Lookups
 
 The key is hashed and the bucket array is searched if it has an entry at that location with that fingerprint. When found,
 the key in the data vector is compared, and when equal the value is returned.
 
-## Removals
+### 4.3. Removals
 
 Since all data is stored in a vector, removals are a bit more complicated:
 
diff --git a/cmake/unordered_denseConfig.cmake.in b/cmake/unordered_denseConfig.cmake.in
new file mode 100644
index 00000000..ff0fa672
--- /dev/null
+++ b/cmake/unordered_denseConfig.cmake.in
@@ -0,0 +1,4 @@
+@PACKAGE_INIT@
+
+include("${CMAKE_CURRENT_LIST_DIR}/@PROJECT_NAME@Targets.cmake")
+check_required_components("@PROJECT_NAME@")
\ No newline at end of file
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--- /dev/null
+++ b/data/fuzz/replace/0eb34fb70c5cc8bec3bd9746d4c0f51848c07599
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\ No newline at end of file
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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new file mode 100644
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--- /dev/null
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@@ -0,0 +1 @@
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new file mode 100644
index 00000000..bed1cfb0
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@@ -0,0 +1 @@
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index 00000000..39672d7f
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diff --git a/data/fuzz/replace/d15b9da5296c0e144a7fc1fb1770216630ca8507 b/data/fuzz/replace/d15b9da5296c0e144a7fc1fb1770216630ca8507
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new file mode 100644
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--- /dev/null
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--- /dev/null
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\ No newline at end of file
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--- /dev/null
+++ b/data/fuzz/replace/df58248c414f342c81e056b40bee12d17a08bf61
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\ No newline at end of file
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--- /dev/null
+++ b/data/fuzz/replace/e0184adedf913b076626646d3f52c3b49c39ad6d
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+E
\ No newline at end of file
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new file mode 100644
index 00000000..e8a0f876
--- /dev/null
+++ b/data/fuzz/replace/e7064f0b80f61dbc65915311032d27baa569ae2a
@@ -0,0 +1 @@
+)
\ No newline at end of file
diff --git a/data/fuzz/replace/e848cdc157c62cd7d4d58214e7780fe7c73714c4 b/data/fuzz/replace/e848cdc157c62cd7d4d58214e7780fe7c73714c4
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new file mode 100644
index 00000000..3aa30940
--- /dev/null
+++ b/data/fuzz/replace/efdd02477ba5da245453eb10fbf017c58578aac3
@@ -0,0 +1 @@
+Хяья-
\ No newline at end of file
diff --git a/data/fuzz/replace/efe43def97eb295fe99c3753f2d740d7b36df689 b/data/fuzz/replace/efe43def97eb295fe99c3753f2d740d7b36df689
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index 00000000..04f7b5be
--- /dev/null
+++ b/data/fuzz/replace/efe43def97eb295fe99c3753f2d740d7b36df689
@@ -0,0 +1 @@
+№
\ No newline at end of file
diff --git a/data/fuzz/replace/f03cf81f2735705fa986bff3966da3bb3ab50086 b/data/fuzz/replace/f03cf81f2735705fa986bff3966da3bb3ab50086
new file mode 100644
index 00000000..8c230c92
--- /dev/null
+++ b/data/fuzz/replace/f03cf81f2735705fa986bff3966da3bb3ab50086
@@ -0,0 +1 @@
+~––––––––––––––––ž–––O––y^
\ No newline at end of file
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diff --git a/example/CMakeLists.txt b/example/CMakeLists.txt
new file mode 100644
index 00000000..19e21948
--- /dev/null
+++ b/example/CMakeLists.txt
@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.12)
+project("UnorderedDenseExample")
+
+add_executable(UnorderedDenseExample main.cpp)
+find_package(unordered_dense CONFIG REQUIRED)
+target_link_libraries(UnorderedDenseExample unordered_dense::unordered_dense)
diff --git a/example/README.md b/example/README.md
new file mode 100644
index 00000000..14fef9b4
--- /dev/null
+++ b/example/README.md
@@ -0,0 +1,16 @@
+A simple example that demonstrats how to make use of `unordered_dense` with cmake.
+
+Use globally installed `unordered_dense`:
+```sh
+mkdir build && cd build
+cmake -DCMAKE_INSTALL_PREFIX:PATH=${HOME}/unordered_dense_install ..
+make
+```
+
+Use locall installed `unordered_dense`, as in the main README.md:
+
+```sh
+mkdir build && cd build
+cmake -DCMAKE_INSTALL_PREFIX:PATH=${HOME}/unordered_dense_install ..
+make
+```
diff --git a/example/main.cpp b/example/main.cpp
new file mode 100644
index 00000000..8e9c65e4
--- /dev/null
+++ b/example/main.cpp
@@ -0,0 +1,13 @@
+#include <ankerl/unordered_dense.h>
+
+#include <iostream>
+
+auto main() -> int {
+    auto map = ankerl::unordered_dense::map<int, std::string>();
+    map[123] = "hello";
+    map[987] = "world!";
+
+    for (auto const& [key, val] : map) {
+        std::cout << key << " => " << val << std::endl;
+    }
+}
diff --git a/include/ankerl/unordered_dense.h b/include/ankerl/unordered_dense.h
index 804d3875..aa84ed40 100644
--- a/include/ankerl/unordered_dense.h
+++ b/include/ankerl/unordered_dense.h
@@ -1,7 +1,7 @@
 ///////////////////////// ankerl::unordered_dense::{map, set} /////////////////////////
 
 // A fast & densely stored hashmap and hashset based on robin-hood backward shift deletion.
-// Version 1.2.0
+// Version 1.3.0
 // https://github.com/martinus/unordered_dense
 //
 // Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@@ -31,7 +31,7 @@
 
 // see https://semver.org/spec/v2.0.0.html
 #define ANKERL_UNORDERED_DENSE_VERSION_MAJOR 1 // incompatible API changes
-#define ANKERL_UNORDERED_DENSE_VERSION_MINOR 2 // add functionality in a backwards compatible manner
+#define ANKERL_UNORDERED_DENSE_VERSION_MINOR 3 // add functionality in a backwards compatible manner
 #define ANKERL_UNORDERED_DENSE_VERSION_PATCH 0 // backwards compatible bug fixes
 
 #if defined(_MSVC_LANG)
@@ -719,7 +719,10 @@ class table {
                    AllocatorOrContainer const& alloc_or_container = AllocatorOrContainer())
         : m_values(alloc_or_container)
         , m_hash(hash)
-        , m_equal(equal) {}
+        , m_equal(equal) {
+        // If alloc_or_container is a container with elements, we don't want the data that was in it
+        m_values.clear();
+    }
 
     table(size_t bucket_count, AllocatorOrContainer const& alloc_or_container)
         : table(bucket_count, Hash(), KeyEqual(), alloc_or_container) {}
@@ -935,6 +938,60 @@ class table {
         return std::move(m_values);
     }
 
+    // nonstandard API:
+    // Discards the internally held container and replaces it with the one passed. Erases non-unique elements.
+    auto replace(value_container_type&& container) {
+        if (container.size() > max_size()) {
+            throw std::out_of_range("ankerl::unordered_dense::map::replace(): too many elements");
+        }
+
+        auto shifts = calc_shifts_for_size(container.size());
+        if (0 == m_num_buckets || shifts < m_shifts || container.get_allocator() != m_values.get_allocator()) {
+            m_shifts = shifts;
+            deallocate_buckets();
+            allocate_buckets_from_shift();
+        }
+        clear_buckets();
+
+        m_values = std::move(container);
+
+        // can't use clear_and_fill_buckets_from_values() because container elements might not be unique
+        auto value_idx = value_idx_type{};
+
+        // loop until we reach the end of the container. duplicated entries will be replaced with back().
+        while (value_idx != static_cast<value_idx_type>(m_values.size())) {
+            auto const& key = get_key(m_values[value_idx]);
+
+            auto hash = mixed_hash(key);
+            auto dist_and_fingerprint = dist_and_fingerprint_from_hash(hash);
+            auto bucket_idx = bucket_idx_from_hash(hash);
+
+            bool key_found = false;
+            while (true) {
+                auto const& bucket = at(m_buckets, bucket_idx);
+                if (dist_and_fingerprint > bucket.dist_and_fingerprint) {
+                    break;
+                }
+                if (dist_and_fingerprint == bucket.dist_and_fingerprint && m_equal(key, m_values[bucket.value_idx].first)) {
+                    key_found = true;
+                    break;
+                }
+                dist_and_fingerprint = dist_inc(dist_and_fingerprint);
+                bucket_idx = next(bucket_idx);
+            }
+
+            if (key_found) {
+                if (value_idx != static_cast<value_idx_type>(m_values.size() - 1)) {
+                    m_values[value_idx] = std::move(m_values.back());
+                }
+                m_values.pop_back();
+            } else {
+                place_and_shift_up({dist_and_fingerprint, value_idx}, bucket_idx);
+                ++value_idx;
+            }
+        }
+    }
+
     template <class M, typename Q = T, std::enable_if_t<!std::is_void_v<Q>, bool> = true>
     auto insert_or_assign(Key const& key, M&& mapped) -> std::pair<iterator, bool> {
         return do_insert_or_assign(key, std::forward<M>(mapped));
@@ -1191,7 +1248,7 @@ class table {
         capa = std::min(capa, max_size());
         m_values.reserve(capa);
         auto shifts = calc_shifts_for_size(std::max(capa, size()));
-        if (shifts < m_shifts) {
+        if (0 == m_num_buckets || shifts < m_shifts) {
             m_shifts = shifts;
             deallocate_buckets();
             allocate_buckets_from_shift();
diff --git a/meson.build b/meson.build
index e178edc2..2f9c1ce0 100644
--- a/meson.build
+++ b/meson.build
@@ -18,7 +18,7 @@
 #
 
 project('unordered_dense', 'cpp',
-    version: '1.2.0',
+    version: '1.3.0',
     license: 'MIT',
     default_options : ['cpp_std=c++17', 'warning_level=3', 'werror=true'])
 
diff --git a/scripts/fuzz_run.sh b/scripts/fuzz_run.sh
index ae754b99..223c8525 100755
--- a/scripts/fuzz_run.sh
+++ b/scripts/fuzz_run.sh
@@ -2,7 +2,11 @@
 set -ev
 
 # Start from a build directory, usually clang_cpp17_release
-# usage: fuzz_run.sh <testname>
+#   ../../scripts/fuzz_run.sh <testname>
+#
+# Found a crash? Minimize it like so:
+#   ./test/fuzz_replace -minimize_crash=1 ./crash-123abcdef
+
 FUZZ_TARGET=$1
 SCRIPT_DIR=`dirname "$0"`
 CORPUS_SMALL=${SCRIPT_DIR}/../data/fuzz/${FUZZ_TARGET}
diff --git a/test/fuzz/replace.cpp b/test/fuzz/replace.cpp
new file mode 100644
index 00000000..a0d90768
--- /dev/null
+++ b/test/fuzz/replace.cpp
@@ -0,0 +1,73 @@
+#include <ankerl/unordered_dense.h>
+#include <app/Counter.h>
+#include <fuzz/Provider.h>
+
+#if defined(FUZZ)
+#    define REQUIRE(x) ::fuzz::Provider::require(x)
+#else
+#    include <doctest.h>
+#endif
+
+#include <unordered_map>
+
+namespace fuzz {
+
+void replace(uint8_t const* data, size_t size) {
+    auto p = fuzz::Provider{data, size};
+
+    auto counts = Counter{};
+
+    using Map = ankerl::unordered_dense::map<Counter::Obj, Counter::Obj>;
+
+    auto initial_size = p.bounded<size_t>(100);
+    auto map = ankerl::unordered_dense::map<Counter::Obj, Counter::Obj>{};
+    for (size_t i = 0; i < initial_size; ++i) {
+        map.try_emplace(Counter::Obj{i, counts}, Counter::Obj{i, counts});
+    }
+
+    // create a container with data in it provided by fuzzer
+    auto container = Map::value_container_type{};
+    auto comparison_container = std::vector<std::pair<size_t, size_t>>();
+    auto v = size_t{};
+    while (p.has_remaining_bytes()) {
+        auto key = p.integral<size_t>();
+        container.emplace_back(Counter::Obj{key, counts}, Counter::Obj{v, counts});
+        comparison_container.emplace_back(key, v);
+        ++v;
+    }
+
+    // create comparison map with the same move-back-forward algorithm
+    auto comparison_map = std::unordered_map<size_t, size_t>{};
+    size_t idx = 0;
+    while (idx != comparison_container.size()) {
+        auto [key, val] = comparison_container[idx];
+        if (comparison_map.try_emplace(key, val).second) {
+            ++idx;
+        } else {
+            comparison_container[idx] = comparison_container.back();
+            comparison_container.pop_back();
+        }
+    }
+
+    map.replace(std::move(container));
+
+    // now check if the data in the map is exactly what we expect
+    REQUIRE(map.size() == comparison_map.size());
+    for (auto [key, val] : comparison_map) {
+        auto key_obj = Counter::Obj{key, counts};
+        auto val_obj = Counter::Obj{val, counts};
+        auto it = map.find(key_obj);
+        REQUIRE(it != map.end());
+        REQUIRE(it->first == key_obj);
+        REQUIRE(it->second == val_obj);
+    }
+}
+
+} // namespace fuzz
+
+#if defined(FUZZ)
+extern "C" auto LLVMFuzzerTestOneInput(uint8_t const* data, size_t size) -> int {
+    fuzz::replace(data, size);
+    return 0;
+}
+#endif
\ No newline at end of file
diff --git a/test/fuzz/replace.h b/test/fuzz/replace.h
new file mode 100644
index 00000000..be3a13b4
--- /dev/null
+++ b/test/fuzz/replace.h
@@ -0,0 +1,10 @@
+#pragma once
+
+#include <cstddef>
+#include <cstdint>
+
+namespace fuzz {
+
+void replace(uint8_t const* data, size_t size);
+
+} // namespace fuzz
diff --git a/test/meson.build b/test/meson.build
index 6e4edd7e..43a7d9c8 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -14,6 +14,7 @@ test_sources = [
 
     'fuzz/api.cpp',
     'fuzz/insert_erase.cpp',
+    'fuzz/replace.cpp',
     'fuzz/string.cpp',
 
     'unit/assign_to_move.cpp',
@@ -57,6 +58,7 @@ test_sources = [
     'unit/not_moveable.cpp',
     'unit/pmr.cpp',
     'unit/rehash.cpp',
+    'unit/replace.cpp',
     'unit/reserve_and_assign.cpp',
     'unit/reserve.cpp',
     'unit/set.cpp',
@@ -186,6 +188,14 @@ if compiler.get_id() == 'clang'
         link_args: fuzz_link_args,
         dependencies: fuzz_deps,
     )
+    executable(
+        'fuzz_replace',
+        fuzz_sources + ['fuzz/replace.cpp'],
+        include_directories: incdir,
+        cpp_args : fuzz_cpp_args,
+        link_args: fuzz_link_args,
+        dependencies: fuzz_deps,
+    )    
     executable(
         'fuzz_insert_erase',
         fuzz_sources + ['fuzz/insert_erase.cpp'],
diff --git a/test/unit/fuzz_corpus.cpp b/test/unit/fuzz_corpus.cpp
index 5124b285..ecf85565 100644
--- a/test/unit/fuzz_corpus.cpp
+++ b/test/unit/fuzz_corpus.cpp
@@ -3,6 +3,7 @@
 
 #include <fuzz/api.h>          // for api
 #include <fuzz/insert_erase.h> // for insert_erase
+#include <fuzz/replace.h>      // for replace
 #include <fuzz/string.h>       // for string
 
 #include <doctest.h>  // for TestCase, MessageBuilder, skip, INFO
@@ -59,7 +60,7 @@ void run_corpus(std::string_view name, Op op) {
     for (auto const& dir_entry : std::filesystem::directory_iterator(path)) {
         ++num_files;
         if (periodic) {
-            fmt::print("\r|{}| {:7}/{}  ", progressbar(num_files), num_files, total_files);
+            fmt::print("\r|{}| {:7}/{:<7}  ", progressbar(num_files), num_files, total_files);
         }
 
         auto const& test_file = dir_entry.path();
@@ -71,7 +72,7 @@ void run_corpus(std::string_view name, Op op) {
         op(reinterpret_cast<uint8_t const*>(content.data()), content.size());
     }
     REQUIRE(0U != num_files);
-    fmt::print("\r|{}| {:7}/{} {}\n", progressbar(num_files), num_files, total_files, path.string());
+    fmt::print("\r|{}| {:7}/{:<7} {}\n", progressbar(num_files), num_files, total_files, path.string());
 }
 
 } // namespace
@@ -80,10 +81,14 @@ TEST_CASE("fuzz_api" * doctest::test_suite("fuzz") * doctest::skip(true)) {
     run_corpus("api", fuzz::api);
 }
 
+TEST_CASE("fuzz_replace" * doctest::test_suite("fuzz") * doctest::skip(true)) {
+    run_corpus("replace", fuzz::replace);
+}
+
 TEST_CASE("fuzz_insert_erase" * doctest::test_suite("fuzz") * doctest::skip(true)) {
     run_corpus("insert_erase", fuzz::insert_erase);
 }
 
 TEST_CASE("fuzz_string" * doctest::test_suite("fuzz") * doctest::skip(true)) {
     run_corpus("string", fuzz::string);
-}
\ No newline at end of file
+}
diff --git a/test/unit/replace.cpp b/test/unit/replace.cpp
new file mode 100644
index 00000000..7b8259a1
--- /dev/null
+++ b/test/unit/replace.cpp
@@ -0,0 +1,35 @@
+#include <ankerl/unordered_dense.h>
+
+#include <app/Counter.h>
+
+#include <doctest.h>
+
+TEST_CASE("replace") {
+    auto counts = Counter{};
+    INFO(counts);
+
+    using Map = ankerl::unordered_dense::map<Counter::Obj, Counter::Obj>;
+    auto container = Map::value_container_type{};
+
+    for (size_t i = 0; i < 100; ++i) {
+        container.emplace_back(Counter::Obj{i, counts}, Counter::Obj{i, counts});
+        container.emplace_back(Counter::Obj{i, counts}, Counter::Obj{i, counts});
+    }
+
+    for (size_t i = 0; i < 10; ++i) {
+        container.emplace_back(Counter::Obj{i, counts}, Counter::Obj{i, counts});
+    }
+
+    // add some elements
+    auto map = Map();
+    for (size_t i = 0; i < 10; ++i) {
+        map.try_emplace(Counter::Obj{i, counts}, Counter::Obj{i, counts});
+    }
+
+    map.replace(std::move(container));
+
+    REQUIRE(map.size() == 100U);
+    for (size_t i = 0; i < 100; ++i) {
+        REQUIRE(map.contains(Counter::Obj{i, counts}));
+    }
+}