diff -r b60487c3ec36 -r af685cc9d623 ucx/hash_key.c
--- a/ucx/hash_key.c	Sun Aug 31 14:39:13 2025 +0200
+++ b/ucx/hash_key.c	Sat Nov 08 23:06:11 2025 +0100
@@ -27,6 +27,7 @@
  */
 
 #include "cx/hash_key.h"
+#include "cx/compare.h"
 #include <string.h>
 
 void cx_hash_murmur(CxHashKey *key) {
@@ -62,14 +63,14 @@
     switch (len) {
         case 3:
             h ^= (data[i + 2] & 0xFF) << 16;
-                    __attribute__((__fallthrough__));
+            cx_attr_fallthrough;
         case 2:
             h ^= (data[i + 1] & 0xFF) << 8;
-                    __attribute__((__fallthrough__));
+            cx_attr_fallthrough;
         case 1:
             h ^= (data[i + 0] & 0xFF);
             h *= m;
-                    __attribute__((__fallthrough__));
+            cx_attr_fallthrough;
         default: // do nothing
             ;
     }
@@ -81,6 +82,21 @@
     key->hash = h;
 }
 
+
+uint32_t cx_hash_u32(uint32_t x) {
+    x = ((x >> 16) ^ x) * 0x45d9f3bu;
+    x = ((x >> 16) ^ x) * 0x45d9f3bu;
+    x = (x >> 16) ^ x;
+    return x;
+}
+
+uint64_t cx_hash_u64(uint64_t x) {
+    x = (x ^ (x >> 30)) * UINT64_C(0xbf58476d1ce4e5b9);
+    x = (x ^ (x >> 27)) * UINT64_C(0x94d049bb133111eb);
+    x = x ^ (x >> 31);
+    return x;
+}
+
 CxHashKey cx_hash_key_str(const char *str) {
     CxHashKey key;
     key.data = str;
@@ -89,6 +105,22 @@
     return key;
 }
 
+CxHashKey cx_hash_key_ustr(unsigned const char *str) {
+    CxHashKey key;
+    key.data = str;
+    key.len = str == NULL ? 0 : strlen((const char*)str);
+    cx_hash_murmur(&key);
+    return key;
+}
+
+CxHashKey cx_hash_key_cxstr(cxstring str) {
+    return cx_hash_key(str.ptr, str.length);
+}
+
+CxHashKey cx_hash_key_mutstr(cxmutstr str) {
+    return cx_hash_key(str.ptr, str.length);
+}
+
 CxHashKey cx_hash_key_bytes(
         const unsigned char *bytes,
         size_t len
@@ -110,3 +142,31 @@
     cx_hash_murmur(&key);
     return key;
 }
+
+CxHashKey cx_hash_key_u32(uint32_t x) {
+    CxHashKey key;
+    key.data = NULL;
+    key.len = 0;
+    key.hash = cx_hash_u32(x);
+    return key;
+}
+
+CxHashKey cx_hash_key_u64(uint64_t x) {
+    CxHashKey key;
+    key.data = NULL;
+    key.len = 0;
+    key.hash = cx_hash_u64(x);
+    return key;
+}
+
+int cx_hash_key_cmp(const void *l, const void *r) {
+    const CxHashKey *left = l;
+    const CxHashKey *right = r;
+    int d;
+    d = cx_vcmp_uint64(left->hash, right->hash);
+    if (d != 0) return d;
+    d = cx_vcmp_size(left->len, right->len);
+    if (d != 0) return d;
+    if (left->len == 0) return 0;
+    return memcmp(left->data, right->data, left->len);
+}