feat(cosmos): Support arbitrary core eval builder arguments

golang/cosmos/app/upgrade.go

@@ -3,6 +3,7 @@ package gaia
 import (
 	"encoding/json"
 	"fmt"
+	"reflect"
 	"strings"
 	"text/template"
 
@@ -77,14 +78,24 @@ func isFirstTimeUpgradeOfThisVersion(app *GaiaApp, ctx sdk.Context) bool {
 	return true
 }
 
-func buildProposalStepWithArgs(moduleName string, entrypoint string, opts map[string]any) (vm.CoreProposalStep, error) {
+func buildProposalStepWithArgs(moduleName string, entrypoint string, opts any) (vm.CoreProposalStep, error) {
 	t := template.Must(template.New("").Parse(`{
-		"module": "{{.moduleName}}",
-		"entrypoint": "{{.entrypoint}}",
-		"args": [ {{.optsArg}} ]
-	}`))
+  "module": "{{.moduleName}}",
+  "entrypoint": "{{.entrypoint}}",
+  "args": {{.args}}
+}`))
 
-	optsArg, err := json.Marshal(opts)
+	var args []byte
+	var err error
+	if opts == nil {
+		args = []byte(`[]`)
+	} else if reflect.TypeOf(opts).Kind() == reflect.Slice {
+		args, err = json.Marshal(opts)
+	} else if reflect.TypeOf(opts).Kind() == reflect.Map && reflect.TypeOf(opts).Key().Kind() == reflect.String {
+		args, err = json.Marshal([]any{opts})
+	} else {
+		return nil, fmt.Errorf("proposal opts must be nil, array, or string map, not %v", opts)
+	}
 	if err != nil {
 		return nil, err
 	}
@@ -93,7 +104,7 @@ func buildProposalStepWithArgs(moduleName string, entrypoint string, opts map[st
 	err = t.Execute(&result, map[string]any{
 		"moduleName": moduleName,
 		"entrypoint": entrypoint,
-		"optsArg":    string(optsArg),
+		"args":       string(args),
 	})
 	if err != nil {
 		return nil, err