fix: remove unnecessary cms typecasting (backport #14054) (#15669)

Co-authored-by: Javier Su <javier.su.weijie@gmail.com>
Co-authored-by: Julien Robert <julien@rbrt.fr>

CHANGELOG.md

@@ -45,6 +45,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * (simapp) [#15305](https://github.com/cosmos/cosmos-sdk/pull/15305) Add `AppStateFnWithExtendedCb` with callback function to extend rawState and `AppStateRandomizedFnWithState` with extra genesisState argument which is the genesis state of the app.
 * (x/distribution) [#15462](https://github.com/cosmos/cosmos-sdk/pull/15462) Add delegator address to the event for withdrawing delegation rewards
+* [#14019](https://github.com/cosmos/cosmos-sdk/issues/14019) Remove the interface casting to allow other implementations of a `CommitMultiStore`.
 
 ### Bug Fixes
 

baseapp/baseapp.go

@@ -1,6 +1,7 @@
 package baseapp
 
 import (
+	"errors"
 	"fmt"
 	"strings"
 
@@ -14,7 +15,6 @@ import (
 	codectypes "github.com/cosmos/cosmos-sdk/codec/types"
 	"github.com/cosmos/cosmos-sdk/snapshots"
 	"github.com/cosmos/cosmos-sdk/store"
-	"github.com/cosmos/cosmos-sdk/store/rootmulti"
 	storetypes "github.com/cosmos/cosmos-sdk/store/types"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
@@ -352,11 +352,11 @@ func (app *BaseApp) Init() error {
 	app.setCheckState(tmproto.Header{})
 	app.Seal()
 
-	rms, ok := app.cms.(*rootmulti.Store)
-	if !ok {
-		return fmt.Errorf("invalid commit multi-store; expected %T, got: %T", &rootmulti.Store{}, app.cms)
+	if app.cms == nil {
+		return errors.New("commit multi-store must not be nil")
 	}
-	return rms.GetPruning().Validate()
+
+	return app.cms.GetPruning().Validate()
 }
 
 func (app *BaseApp) setMinGasPrices(gasPrices sdk.DecCoins) {