diff --git a/json/src/main/scala-2.12/fs2/data/package.scala b/json/src/main/scala-2.12/fs2/data/package.scala
new file mode 100644
index 000000000..236521db3
--- /dev/null
+++ b/json/src/main/scala-2.12/fs2/data/package.scala
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2023 Lucas Satabin
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package fs2
+
+import scala.collection.immutable.VectorBuilder
+import scala.collection.mutable.ListBuffer
+
+package object data {
+
+  implicit class VectorBuilderOps[T](val builder: VectorBuilder[T]) extends AnyVal {
+    def addOne(t: T) = builder += t
+  }
+
+  implicit class ListBufferOps[T](val buffer: ListBuffer[T]) extends AnyVal {
+    def addOne(t: T) = buffer += t
+  }
+
+}
diff --git a/json/src/main/scala/fs2/data/json/internal/ChunkAccumulator.scala b/json/src/main/scala/fs2/data/json/internal/ChunkAccumulator.scala
index 381584c40..71bec0375 100644
--- a/json/src/main/scala/fs2/data/json/internal/ChunkAccumulator.scala
+++ b/json/src/main/scala/fs2/data/json/internal/ChunkAccumulator.scala
@@ -27,7 +27,7 @@ package internals
   * chunk under construction, but results still being built are kept.
   * This allows to accumulate values acros upstream chunk boundaries.
   */
-private[internals] trait ChunkAccumulator[Res] {
+private[json] trait ChunkAccumulator[Res] {
 
   def startObject(): this.type
 
diff --git a/json/src/main/scala/fs2/data/json/internal/LegacyTokenParser.scala b/json/src/main/scala/fs2/data/json/internal/LegacyTokenParser.scala
index ff6aed95b..8dd201769 100644
--- a/json/src/main/scala/fs2/data/json/internal/LegacyTokenParser.scala
+++ b/json/src/main/scala/fs2/data/json/internal/LegacyTokenParser.scala
@@ -194,7 +194,7 @@ private[json] class LegacyTokenParser[F[_], T, Res](s: Stream[F, T])(implicit
           number_(context, state, acc, chunkAcc)
         case None =>
           if (NumberState.isFinal(state))
-            Pull.pure(T.create(Stream.empty), chunkAcc.numberValue(acc.result()))
+            Pull.pure((T.create(Stream.empty), chunkAcc.numberValue(acc.result())))
           else
             Pull.raiseError[F](new JsonException("unexpected end of input"))
       }