Remove string key restriction for maps in LookupEncoder/LookupDecoder.

GODRIVER-713

Change-Id: Id30100a8bdb64f9cea15b42449632583a41e9f07

Author: Divjot Arora

bson/bsoncodec/registry.go

@@ -265,13 +265,6 @@ func (r *Registry) LookupEncoder(t reflect.Type) (ValueEncoder, error) {
 		return enc, nil
 	}
 
-	if t != nil && t.Kind() == reflect.Map && t.Key().Kind() != reflect.String {
-		r.mu.Lock()
-		r.typeEncoders[t] = nil
-		r.mu.Unlock()
-		return nil, encodererr
-	}
-
 	if t == nil {
 		r.mu.Lock()
 		r.typeEncoders[t] = nil
@@ -340,13 +333,6 @@ func (r *Registry) LookupDecoder(t reflect.Type) (ValueDecoder, error) {
 		return dec, nil
 	}
 
-	if t.Kind() == reflect.Map && t.Key().Kind() != reflect.String {
-		r.mu.Lock()
-		r.typeDecoders[t] = nil
-		r.mu.Unlock()
-		return nil, decodererr
-	}
-
 	dec, found = r.kindDecoders[t.Kind()]
 	if !found {
 		r.mu.Lock()

bson/bsoncodec/registry_test.go

@@ -253,8 +253,8 @@ func TestRegistry(t *testing.T) {
 				{
 					"map non-string key",
 					reflect.TypeOf(map[int]int{}),
+					fmc,
 					nil,
-					ErrNoEncoder{Type: reflect.TypeOf(map[int]int{})},
 					false,
 				},
 				{