review suggestions

pkg/scale/btree.go

@@ -5,17 +5,12 @@ package scale
 
 import (
 	"fmt"
+	"golang.org/x/exp/constraints"
 	"reflect"
 
 	"github.com/tidwall/btree"
 )
 
-type Ordered interface {
-	~int | ~int8 | ~int16 | ~int32 | ~int64 |
-		~uint | ~uint8 | ~uint16 | ~uint32 | ~uint64 | ~uintptr |
-		~float32 | ~float64 | ~string
-}
-
 type BTreeCodec interface {
 	Encode(es *encodeState) error
 	Decode(ds *decodeState, dstv reflect.Value) error
@@ -103,7 +98,7 @@ func NewBTree[T any](comparator func(a, b any) bool) *BTree {
 }
 
 // BTreeMap is a wrapper around tidwall/btree.Map
-type BTreeMap[K Ordered, V any] struct {
+type BTreeMap[K constraints.Ordered, V any] struct {
 	*btree.Map[K, V]
 	Degree int
 }
@@ -180,7 +175,7 @@ func (btm *BTreeMap[K, V]) Copy() BTreeMap[K, V] {
 }
 
 // NewBTreeMap creates a new BTreeMap with the given degree.
-func NewBTreeMap[K Ordered, V any](degree int) *BTreeMap[K, V] {
+func NewBTreeMap[K constraints.Ordered, V any](degree int) *BTreeMap[K, V] {
 	return &BTreeMap[K, V]{
 		Map: btree.NewMap[K, V](degree),
 	}

pkg/scale/decode.go

@@ -147,8 +147,6 @@ func (ds *decodeState) unmarshal(dstv reflect.Value) (err error) {
 		err = ds.decodeVaryingDataType(dstv)
 	case VaryingDataTypeSlice:
 		err = ds.decodeVaryingDataTypeSlice(dstv)
-	case BTree:
-		err = ds.decodeBTree(dstv)
 	default:
 		t := reflect.TypeOf(in)
 		switch t.Kind() {