diff --git a/generate/generate.go b/generate/generate.go
index 2d26796..4ef14de 100644
--- a/generate/generate.go
+++ b/generate/generate.go
@@ -272,8 +272,8 @@ func (this *Generator) generateEncodeValue(typ Type, valueSource, tagSource stri
 		n += nn; if err != nil { return n, err }
 		this.push()
 			nn, err = this.iprintf(
-				"nn, err = encoder.WriteUintN(uint64(%s.CN()), len(%s))\n",
-				tagSource, valueSource)
+				"nn, err = encoder.WriteUintN(uint64(len(%s)), %s.CN())\n",
+				valueSource, tagSource)
 			n += nn; if err != nil { return n, err }
 			nn, err = this.generateErrorCheck()
 			n += nn; if err != nil { return n, err }
@@ -288,8 +288,8 @@ func (this *Generator) generateEncodeValue(typ Type, valueSource, tagSource stri
 	case TypeArray:
 		// OTA: <length: UN> <elementTag: tape.Tag> <values>*
 		nn, err := this.iprintf(
-			"nn, err = encoder.WriteUintN(uint64(%s.CN()), len(%s))\n",
-			tagSource, valueSource)
+			"nn, err = encoder.WriteUintN(uint64(len(%s)), %s.CN())\n",
+			valueSource, tagSource)
 		n += nn; if err != nil { return n, err }
 		nn, err = this.generateErrorCheck()
 		n += nn; if err != nil { return n, err }
@@ -325,6 +325,10 @@ func (this *Generator) generateEncodeValue(typ Type, valueSource, tagSource stri
 			n += nn; if err != nil { return n, err }
 			nn, err = this.iprintf("if itemTag.Is(tape.SBA) { itemTag += 1 << 5 }\n")
 			n += nn; if err != nil { return n, err }
+			nn, err = this.iprintf("nn, err = encoder.WriteTag(itemTag)\n")
+			n += nn; if err != nil { return n, err }
+			n += nn; if err != nil { return n, err }
+			nn, err = this.generateErrorCheck()
 			nn, err = this.iprintf("for _, item := range %s {\n", valueSource)
 			n += nn; if err != nil { return n, err }
 			this.push()