diff --git a/src/libexpr/eval.cc b/src/libexpr/eval.cc
index 48aff9e3f64..6bcde92832e 100644
--- a/src/libexpr/eval.cc
+++ b/src/libexpr/eval.cc
@@ -232,15 +232,6 @@ EvalMemory::EvalMemory()
     assertGCInitialized();
 }
 
-Value * EvalMemory::allocInt(NixInt::Inner n)
-{
-    if (n >= 0 && n < (NixInt::Inner) Value::vSmallInts.size())
-        return &Value::vSmallInts[n];
-    Value * v = allocValue();
-    v->mkInt(NixInt(n));
-    return v;
-}
-
 EvalState::EvalState(
     const LookupPath & lookupPathFromArguments,
     ref<Store> store,
diff --git a/src/libexpr/include/nix/expr/eval.hh b/src/libexpr/include/nix/expr/eval.hh
index 840881bf148..b70c9db789d 100644
--- a/src/libexpr/include/nix/expr/eval.hh
+++ b/src/libexpr/include/nix/expr/eval.hh
@@ -357,8 +357,6 @@ public:
         return stats;
     }
 
-    Value * allocInt(NixInt::Inner n);
-
     /**
      * Storage for the AST nodes
      */
diff --git a/src/libexpr/include/nix/expr/value.hh b/src/libexpr/include/nix/expr/value.hh
index 226bf19a7de..6f533b73b20 100644
--- a/src/libexpr/include/nix/expr/value.hh
+++ b/src/libexpr/include/nix/expr/value.hh
@@ -1016,13 +1016,6 @@ struct Value : public ValueStorage<sizeof(void *)>
      */
     static Value vFalse;
 
-    /**
-     * Small pre-allocated integer constants.
-     *
-     * These are _not_ singletons. Pointer equality is _not_ sufficient.
-     */
-    static std::array<Value, 32> vSmallInts;
-
 private:
     template<InternalType... discriminator>
     bool isa() const noexcept
diff --git a/src/libexpr/primops.cc b/src/libexpr/primops.cc
index 4d6957c288a..98b4c129627 100644
--- a/src/libexpr/primops.cc
+++ b/src/libexpr/primops.cc
@@ -3161,7 +3161,8 @@ static struct LazyPosAccessors
 
     void operator()(EvalState & state, const PosIdx pos, Value & line, Value & column)
     {
-        auto posV = state.mem.allocInt(pos.id);
+        Value * posV = state.allocValue();
+        posV->mkInt(pos.id);
         line.mkApp(&lineOfPos, posV);
         column.mkApp(&columnOfPos, posV);
     }
@@ -3965,8 +3966,11 @@ static void prim_genList(EvalState & state, const PosIdx pos, Value ** args, Val
     state.forceFunction(*args[0], noPos, "while evaluating the first argument passed to builtins.genList");
 
     auto list = state.buildList(len);
-    for (const auto & [n, v] : enumerate(list))
-        (v = state.allocValue())->mkApp(args[0], state.mem.allocInt(n));
+    for (const auto & [n, v] : enumerate(list)) {
+        auto arg = state.allocValue();
+        arg->mkInt(n);
+        (v = state.allocValue())->mkApp(args[0], arg);
+    }
     v.mkList(list);
 }
 
diff --git a/src/libexpr/primops/imap.cc b/src/libexpr/primops/imap.cc
deleted file mode 100644
index 465796cf217..00000000000
--- a/src/libexpr/primops/imap.cc
+++ /dev/null
@@ -1,44 +0,0 @@
-#include "nix/expr/primops.hh"
-
-namespace nix {
-
-static void prim_imap(EvalState & state, const PosIdx pos, Value ** args, Value & v)
-{
-    auto shift = state.forceInt(*args[0], pos, "while evaluating the first argument passed to 'builtins.imap'").value;
-    Value & f = *args[1];
-    Value & list = *args[2];
-
-    state.forceList(list, pos, "while evaluating the third argument passed to 'builtins.imap'");
-
-    if (list.listSize() == 0) {
-        v = list;
-        return;
-    }
-
-    auto outList = state.buildList(list.listSize());
-    for (const auto & [n, v] : enumerate(outList)) {
-        v = state.allocValue();
-        Value * args[] = {state.mem.allocInt(n + shift), list.listView()[n]};
-        state.callFunction(f, args, *v, pos);
-    }
-
-    v.mkList(outList);
-}
-
-static RegisterPrimOp primop_imap(
-    {.name = "__imap",
-     .args = {"shift", "f", "list"},
-     .doc = R"(
-       Apply the function *f* to each element in the list *list*. The function *f* is called with two arguments: the index of the element (plus *shift*) and the element itself.
-
-       For example,
-
-       ```nix
-       builtins.imap 1 (i: v: "${v}-${toString i}") ["a" "b"]
-       ```
-
-       evaluates to `[ "a-1" "b-2" ]`.
-     )",
-     .fun = prim_imap});
-
-} // namespace nix
diff --git a/src/libexpr/primops/meson.build b/src/libexpr/primops/meson.build
index 73fa3911d1b..b8abc6409af 100644
--- a/src/libexpr/primops/meson.build
+++ b/src/libexpr/primops/meson.build
@@ -9,5 +9,4 @@ sources += files(
   'fetchMercurial.cc',
   'fetchTree.cc',
   'fromTOML.cc',
-  'imap.cc',
 )
diff --git a/src/libexpr/value.cc b/src/libexpr/value.cc
index ec39ce43153..07d036b0dd4 100644
--- a/src/libexpr/value.cc
+++ b/src/libexpr/value.cc
@@ -26,11 +26,4 @@ Value Value::vFalse = []() {
     return res;
 }();
 
-std::array<Value, 32> Value::vSmallInts = []() {
-    decltype(Value::vSmallInts) arr;
-    for (size_t i = 0; i < arr.size(); ++i)
-        arr[i].mkInt(i);
-    return arr;
-}();
-
 } // namespace nix
diff --git a/tests/functional/lang/eval-okay-imap.exp b/tests/functional/lang/eval-okay-imap.exp
deleted file mode 100644
index 5ede7fa1955..00000000000
--- a/tests/functional/lang/eval-okay-imap.exp
+++ /dev/null
@@ -1 +0,0 @@
-[ "a-0" "b-1" "a-1" "b-2" ]
diff --git a/tests/functional/lang/eval-okay-imap.nix b/tests/functional/lang/eval-okay-imap.nix
deleted file mode 100644
index 63a9ffb2682..00000000000
--- a/tests/functional/lang/eval-okay-imap.nix
+++ /dev/null
@@ -1,8 +0,0 @@
-(builtins.imap 0 (i: v: "${v}-${toString i}") [
-  "a"
-  "b"
-])
-++ (builtins.imap 1 (i: v: "${v}-${toString i}") [
-  "a"
-  "b"
-])