diff -r 921f83a8943f -r d218607f5a7e src/ucx/hash_key.c
--- a/src/ucx/hash_key.c	Sat Mar 25 17:18:51 2023 +0100
+++ b/src/ucx/hash_key.c	Fri May 05 18:02:11 2023 +0200
@@ -30,7 +30,7 @@
 #include <string.h>
 
 void cx_hash_murmur(CxHashKey *key) {
-    unsigned char const *data = key->data.cbytes;
+    unsigned char const *data = key->data;
     if (data == NULL) {
         // extension: special value for NULL
         key->hash = 1574210520u;
@@ -71,7 +71,7 @@
             h *= m;
                     __attribute__((__fallthrough__));
         default: // do nothing
-        ;
+            ;
     }
 
     h ^= h >> 13;
@@ -83,7 +83,7 @@
 
 CxHashKey cx_hash_key_str(char const *str) {
     CxHashKey key;
-    key.data.cstr = str;
+    key.data = str;
     key.len = str == NULL ? 0 : strlen(str);
     cx_hash_murmur(&key);
     return key;
@@ -94,7 +94,7 @@
         size_t len
 ) {
     CxHashKey key;
-    key.data.cbytes = bytes;
+    key.data = bytes;
     key.len = len;
     cx_hash_murmur(&key);
     return key;
@@ -105,7 +105,7 @@
         size_t len
 ) {
     CxHashKey key;
-    key.data.cobj = obj;
+    key.data = obj;
     key.len = len;
     cx_hash_murmur(&key);
     return key;