fixup

lib/internal/streams/readable.js

@@ -378,8 +378,8 @@ function readableAddChunk(stream, chunk, encoding, addToFront) {
   if ((state.state & kObjectMode) === 0) {
     if (typeof chunk === 'string') {
       encoding = encoding || ((state.state & kDefaultUTF8Encoding) !== 0 ? 'utf8' : state[kDefaultEncodingValue]);
-      if ((state.state | kEncoding) === 0 || state.encoding !== encoding) {
-        if (addToFront && state.encoding) {
+      if ((state.state & kEncoding) === 0 || state.encoding !== encoding) {
+        if (addToFront && (state.state & kEncoding) !== 0) {
           // When unshifting, if state.encoding is set, we have to save
           // the string in the BufferList with the state encoding.
           chunk = Buffer.from(chunk, encoding).toString(state.encoding);
@@ -412,7 +412,7 @@ function readableAddChunk(stream, chunk, encoding, addToFront) {
         return false;
       else
         addChunk(stream, state, chunk, true);
-    } else if (state.ended) {
+    } else if ((state.state & kEnded) !== 0) {
       errorOrDestroy(stream, new ERR_STREAM_PUSH_AFTER_EOF());
     } else if ((state.state & (kDestroyed | kErrored)) !== 0) {
       return false;
@@ -436,7 +436,7 @@ function readableAddChunk(stream, chunk, encoding, addToFront) {
   // We can push more data if we are below the highWaterMark.
   // Also, if we have no data yet, we can stand some more bytes.
   // This is to work around cases where hwm=0, such as the repl.
-  return !state.ended &&
+  return (state.state & kEnded) === 0 &&
     (state.length < state.highWaterMark || state.length === 0);
 }