atkey_u.patch

diff --git a/src/6model/reprconv.c b/src/6model/reprconv.c
index d47003271..3612b1fe0 100644
--- a/src/6model/reprconv.c
+++ b/src/6model/reprconv.c
@@ -485,6 +485,19 @@ MVMint64 MVM_repr_at_key_i(MVMThreadContext *tc, MVMObject *obj, MVMString *key)
     return value.i64;
 }
 
+MVMuint64 MVM_repr_at_key_u(MVMThreadContext *tc, MVMObject *obj, MVMString *key) {
+    MVMRegister value;
+    if (REPR(obj)->ID == MVM_REPR_ID_MVMHash) {
+        MVMHash_at_key(tc, STABLE(obj), obj, OBJECT_BODY(obj),
+            (MVMObject *)key, &value, MVM_reg_uint64);
+    }
+    else {
+        REPR(obj)->ass_funcs.at_key(tc, STABLE(obj), obj, OBJECT_BODY(obj),
+                                (MVMObject *)key, &value, MVM_reg_uint64);
+    }
+    return value.u64;
+}
+
 MVMnum64 MVM_repr_at_key_n(MVMThreadContext *tc, MVMObject *obj, MVMString *key) {
     MVMRegister value;
     if (REPR(obj)->ID == MVM_REPR_ID_MVMHash) {
diff --git a/src/6model/reprconv.h b/src/6model/reprconv.h
index 1f869b153..2974cfdba 100644
--- a/src/6model/reprconv.h
+++ b/src/6model/reprconv.h
@@ -76,6 +76,7 @@ MVM_PUBLIC MVMString * MVM_repr_shift_s(MVMThreadContext *tc, MVMObject *obj);
 MVM_PUBLIC MVMObject * MVM_repr_shift_o(MVMThreadContext *tc, MVMObject *obj);
 
 MVM_PUBLIC MVMint64    MVM_repr_at_key_i(MVMThreadContext *tc, MVMObject *obj, MVMString *key);
+MVM_PUBLIC MVMuint64   MVM_repr_at_key_u(MVMThreadContext *tc, MVMObject *obj, MVMString *key);
 MVM_PUBLIC MVMnum64    MVM_repr_at_key_n(MVMThreadContext *tc, MVMObject *obj, MVMString *key);
 MVM_PUBLIC MVMString * MVM_repr_at_key_s(MVMThreadContext *tc, MVMObject *obj, MVMString *key);
 MVM_PUBLIC MVMObject * MVM_repr_at_key_o(MVMThreadContext *tc, MVMObject *obj, MVMString *key);
diff --git a/src/jit/graph.c b/src/jit/graph.c
index 274b6967a..6b38a8e65 100644
--- a/src/jit/graph.c
+++ b/src/jit/graph.c
@@ -200,6 +200,7 @@ static void * op_to_func(MVMThreadContext *tc, MVMint16 opcode) {
     case MVM_OP_atkey_n: return MVM_repr_at_key_n;
     case MVM_OP_atkey_s: return MVM_repr_at_key_s;
     case MVM_OP_atkey_o: return MVM_repr_at_key_o;
+    case MVM_OP_atkey_u: return MVM_repr_at_key_u;
 
     case MVM_OP_bindpos_i: return MVM_repr_bind_pos_i;
     case MVM_OP_bindpos_n: return MVM_repr_bind_pos_n;
@@ -800,6 +801,7 @@ static MVMint32 consume_reprop(MVMThreadContext *tc, MVMJitGraph *jg,
         case MVM_OP_atkey_n:
         case MVM_OP_atkey_s:
         case MVM_OP_atkey_o:
+        case MVM_OP_atkey_u:
         case MVM_OP_elems:
         case MVM_OP_shift_i:
         case MVM_OP_shift_n:
@@ -847,6 +849,7 @@ static MVMint32 consume_reprop(MVMThreadContext *tc, MVMJitGraph *jg,
             case MVM_OP_atkey_n:
             case MVM_OP_atkey_s:
             case MVM_OP_atkey_o:
+            case MVM_OP_atkey_u:
                 alternative = 1;
             case MVM_OP_atpos_i:
             case MVM_OP_atpos_n:
@@ -878,6 +881,7 @@ static MVMint32 consume_reprop(MVMThreadContext *tc, MVMJitGraph *jg,
                                          { MVM_JIT_REG_ADDR, dst },
                                          { MVM_JIT_LITERAL,
                                              op == MVM_OP_atpos_i || op == MVM_OP_atkey_i ? MVM_reg_int64 :
+                                             op == MVM_OP_atkey_u ? MVM_reg_uint64 :
                                              op == MVM_OP_atpos_n || op == MVM_OP_atkey_n ? MVM_reg_num64 :
                                              op == MVM_OP_atpos_s || op == MVM_OP_atkey_s ? MVM_reg_str :
                                                                     MVM_reg_obj } };
@@ -1454,6 +1458,7 @@ skipdevirt:
     }
     case MVM_OP_existspos:
     case MVM_OP_atkey_i:
+    case MVM_OP_atkey_u:
     case MVM_OP_atpos_i: {
         MVMint16 dst = ins->operands[0].reg.orig;
         MVMint32 invocant = ins->operands[1].reg.orig;
@@ -2487,6 +2492,7 @@ static MVMint32 consume_ins(MVMThreadContext *tc, MVMJitGraph *jg,
     case MVM_OP_atkey_n:
     case MVM_OP_atkey_s:
     case MVM_OP_atkey_o:
+    case MVM_OP_atkey_u:
     case MVM_OP_bindpos_i:
     case MVM_OP_bindpos_n:
     case MVM_OP_bindpos_s: