--- t0.yaml	2020-12-07 00:27:06.000000000 +0100
+++ t1.yaml	2020-12-07 00:33:00.000000000 +0100
@@ -2668,8 +2668,7 @@
           items: *ApiByronWallet
 
 x-responsesGetUTxOsStatistics: &responsesGetUTxOsStatistics
-  <<: *responsesErr404WalletNotFound
-  <<: *responsesErr406
+  <<: [*responsesErr404WalletNotFound, *responsesErr406]
   200:
     description: Ok
     content:
@@ -2677,10 +2676,7 @@
         schema: *ApiWalletUTxOsStatistics
 
 x-responsesPostWallet: &responsesPostWallet
-  <<: *responsesErr400
-  <<: *responsesErr406
-  <<: *responsesErr409WalletAlreadyExists
-  <<: *responsesErr415UnsupportedMediaType
+  <<: [*responsesErr400, *responsesErr406, *responsesErr409WalletAlreadyExists, *responsesErr415UnsupportedMediaType]
   201:
     description: Created
     content:
@@ -2688,10 +2684,7 @@
         schema: *ApiWallet
 
 x-responsesPostByronWallet: &responsesPostByronWallet
-  <<: *responsesErr400
-  <<: *responsesErr406
-  <<: *responsesErr409
-  <<: *responsesErr415
+  <<: [*responsesErr400, *responsesErr406, *responsesErr409, *responsesErr415]
   201:
     description: Created
     content:
@@ -2699,9 +2692,7 @@
         schema: *ApiByronWallet
 
 x-responsesGetWallet: &responsesGetWallet
-  <<: *responsesErr400
-  <<: *responsesErr404WalletNotFound
-  <<: *responsesErr406
+  <<: [*responsesErr400, *responsesErr404WalletNotFound, *responsesErr406]
   200:
     description: Ok
     content:
@@ -2709,8 +2700,7 @@
         schema: *ApiWallet
 
 x-responsesGetByronWallet: &responsesGetByronWallet
-  <<: *responsesErr404
-  <<: *responsesErr406
+  <<: [*responsesErr404, *responsesErr406]
   200:
     description: Ok
     content:
@@ -2723,8 +2713,7 @@
     content:
       application/json:
         schema: *errNothingToMigrate
-  <<: *responsesErr404WalletNotFound
-  <<: *responsesErr406
+  <<: [*responsesErr404WalletNotFound, *responsesErr406]
   200:
     description: Ok
     content:
@@ -2741,9 +2730,7 @@
             - <<: *errNothingToMigrate
             - <<: *errNoRootKey
             - <<: *errWrongEncryptionPassphrase
-  <<: *responsesErr404WalletNotFound
-  <<: *responsesErr406
-  <<: *responsesErr415UnsupportedMediaType
+  <<: [*responsesErr404WalletNotFound, *responsesErr406, *responsesErr415UnsupportedMediaType]
   200:
     description: Ok
     content:
@@ -2753,26 +2740,17 @@
           items: *ApiTransaction
 
 x-responsesDeleteWallet: &responsesDeleteWallet
-  <<: *responsesErr400
-  <<: *responsesErr404WalletNotFound
-  <<: *responsesErr406
+  <<: [*responsesErr400, *responsesErr404WalletNotFound, *responsesErr406]
   204:
     description: No Content
 
 x-responsesForceResyncWallet: &responsesForceResyncWallet
-  <<: *responsesErr400
-  <<: *responsesErr403
-  <<: *responsesErr404
-  <<: *responsesErr406
-  <<: *responsesErr415
+  <<: [*responsesErr400, *responsesErr403, *responsesErr404, *responsesErr406, *responsesErr415]
   204:
     description: No Content
 
 x-responsesPutWallet: &responsesPutWallet
-  <<: *responsesErr400
-  <<: *responsesErr404WalletNotFound
-  <<: *responsesErr406
-  <<: *responsesErr415UnsupportedMediaType
+  <<: [*responsesErr400, *responsesErr404WalletNotFound, *responsesErr406, *responsesErr415UnsupportedMediaType]
   200:
     description: Ok
     content:
@@ -2780,7 +2758,7 @@
         schema: *ApiWallet
 
 x-responsesPutWalletPassphrase: &responsesPutWalletPassphrase
-  <<: *responsesErr400
+  <<: [*responsesErr400, *responsesErr404WalletNotFound, *responsesErr406, *responsesErr415UnsupportedMediaType]
   403:
     description: Forbidden
     content:
@@ -2789,14 +2767,11 @@
           oneOf:
             - <<: *errNoRootKey
             - <<: *errWrongEncryptionPassphrase
-  <<: *responsesErr404WalletNotFound
-  <<: *responsesErr406
-  <<: *responsesErr415UnsupportedMediaType
   204:
     description: No Content
 
 x-responsesSelectCoins: &responsesSelectCoins
-  <<: *responsesErr400
+  <<: [*responsesErr400, *responsesErr404WalletNotFound, *responsesErr406, *responsesErr415UnsupportedMediaType]
   403:
     description: Forbidden
     content:
@@ -2809,9 +2784,6 @@
             - <<: *errCannotCoverFee
             - <<: *errInputsDepleted
             - <<: *errInvalidCoinSelection
-  <<: *responsesErr404WalletNotFound
-  <<: *responsesErr406
-  <<: *responsesErr415UnsupportedMediaType
   200:
     description: OK
     content:
@@ -2845,8 +2817,7 @@
           oneOf:
             - <<: *errMinWithdrawalWrong
             - <<: *errStartTimeLaterThanEndTime
-  <<: *responsesErr404WalletNotFound
-  <<: *responsesErr406
+  <<: [*responsesErr404WalletNotFound, *responsesErr406]
   200:
     description: Ok
     headers:
@@ -2898,9 +2869,7 @@
             - <<: *errTransactionIsTooBig
             - <<: *errNoRootKey
             - <<: *errWrongEncryptionPassphrase
-  <<: *responsesErr404WalletNotFound
-  <<: *responsesErr406
-  <<: *responsesErr415UnsupportedMediaType
+  <<: [*responsesErr404WalletNotFound, *responsesErr406, *responsesErr415UnsupportedMediaType]
   202:
     description: Accepted
     content:
@@ -2908,9 +2877,7 @@
         schema: *ApiTransaction
 
 x-responsesPostExternalTransaction: &responsesPostExternalTransaction
-  <<: *responsesErr400
-  <<: *responsesErr406
-  <<: *responsesErr415UnsupportedMediaType
+  <<: [*responsesErr400, *responsesErr406, *responsesErr415UnsupportedMediaType]
   202:
     description: Accepted
     content:
@@ -2918,9 +2885,7 @@
         schema: *ApiTxId
 
 x-responsesPostAnyAddress: &responsesPostAnyAddress
-  <<: *responsesErr400
-  <<: *responsesErr406
-  <<: *responsesErr415
+  <<: [*responsesErr400, *responsesErr406, *responsesErr415]
   202:
     description: Accepted
     content:
@@ -2949,9 +2914,7 @@
             - <<: *errInputsDepleted
             - <<: *errInvalidCoinSelection
             - <<: *errTransactionIsTooBig
-  <<: *responsesErr404WalletNotFound
-  <<: *responsesErr406
-  <<: *responsesErr415UnsupportedMediaType
+  <<: [*responsesErr404WalletNotFound, *responsesErr406, *responsesErr415UnsupportedMediaType]
   202:
     description: Accepted
     content:
@@ -2964,8 +2927,7 @@
     content:
       application/json:
         schema: *errCannotCoverFee
-  <<: *responsesErr404WalletNotFound
-  <<: *responsesErr406
+  <<: [*responsesErr404WalletNotFound, *responsesErr406]
   200:
     description: Ok
     content:
@@ -2973,9 +2935,7 @@
         schema: *ApiFee
 
 x-responsesListAddresses: &responsesListAddresses
-  <<: *responsesErr400
-  <<: *responsesErr404WalletNotFound
-  <<: *responsesErr406
+  <<: [*responsesErr400, *responsesErr404WalletNotFound, *responsesErr406]
   200:
     description: Ok
     content:
@@ -2985,9 +2945,7 @@
           items: *ApiAddress
 
 x-responsesGetKey: &responsesGetKey
-  <<: *responsesErr400
-  <<: *responsesErr404
-  <<: *responsesErr406
+  <<: [*responsesErr400, *responsesErr404, *responsesErr406]
   200:
     description: Ok
     content:
@@ -3022,7 +2980,7 @@
           <<: *ApiMaintenanceAction
 
 x-responsesJoinStakePool: &responsesJoinStakePool
-  <<: *responsesErr400
+  <<: [*responsesErr400, *responsesErr406, *responsesErr415UnsupportedMediaType]
   403:
     description: Forbidden
     content:
@@ -3041,8 +2999,6 @@
           oneOf:
             - <<: *errNoSuchWallet
             - <<: *errNoSuchPool
-  <<: *responsesErr406
-  <<: *responsesErr415UnsupportedMediaType
   202:
     description: Accepted
     content:
@@ -3050,7 +3006,7 @@
         schema: *ApiTransaction
 
 x-responsesQuitStakePool: &responsesQuitStakePool
-  <<: *responsesErr400
+  <<: [*responsesErr400, *responsesErr404WalletNotFound, *responsesErr406, *responsesErr415UnsupportedMediaType]
   403:
     description: Forbidden
     content:
@@ -3062,9 +3018,6 @@
             - <<: *errWrongEncryptionPassphrase
             - <<: *errNotDelegatingTo
             - <<: *errNonNullRewards
-  <<: *responsesErr404WalletNotFound
-  <<: *responsesErr406
-  <<: *responsesErr415UnsupportedMediaType
   202:
     description: Accepted
     content:
@@ -3096,10 +3049,7 @@
         schema: *ApiNetworkParameters
 
 x-responsesPostRandomAddress: &responsesPostRandomAddress
-  <<: *responsesErr400
-  <<: *responsesErr403
-  <<: *responsesErr406
-  <<: *responsesErr415
+  <<: [*responsesErr400, *responsesErr403, *responsesErr406, *responsesErr415]
   201:
     description: Created
     content:
@@ -3107,14 +3057,12 @@
         schema: *ApiAddress
 
 x-responsesPutRandomAddress: &responsesPutRandomAddress
-  <<: *responsesErr400
-  <<: *responsesErr403
+  <<: [*responsesErr400, *responsesErr403]
   204:
     description: No Content
 
 x-responsesPutRandomAddresses: &responsesPutRandomAddresses
-  <<: *responsesErr400
-  <<: *responsesErr403
+  <<: [*responsesErr400, *responsesErr403]
   204:
     description: No Content
 
@@ -3127,8 +3075,7 @@
         schema: *ApiAddressInspect
 
 x-responsesPutSettings: &responsesPutSettings
-  <<: *responsesErr400
-  <<: *responsesErr415UnsupportedMediaType
+  <<: [*responsesErr400, *responsesErr415UnsupportedMediaType]
   204:
     description: No Content
 
@@ -3140,9 +3087,7 @@
         schema: *ApiGetSettings
 
 x-responsesPostSignatures: &responsesPostSignatures
-    <<: *responsesErr400
-    <<: *responsesErr406
-    <<: *responsesErr415
+    <<: [*responsesErr400, *responsesErr406, *responsesErr415]
     200:
       description: OK
       content:
@@ -3152,8 +3097,7 @@
             format: binary
 
 x-responsesGetSmashHealth: &responsesGetSmashHealth
-  <<: *responsesErr400
-  <<: *responsesErr406
+  <<: [*responsesErr400, *responsesErr406]
   200:
     description: Ok
     content: