allow building on 386 arch (#147)

Author: harshavardhana

.github/workflows/go.yml

@@ -51,5 +51,13 @@ jobs:
       uses: actions/checkout@v1
 
     - name: Test on ${{ matrix.os }}
+      if: matrix.os == 'ubuntu-latest'
       run: |
-         go test -race ./...
+         go test -v -race ./...
+         GOARCH=386 GOOS=linux go test -v ./...
+
+    - name: Test on ${{ matrix.os }}
+      if: matrix.os != 'ubuntu-latest'
+      run: |
+         go test -v -race ./...
+

estream/writer.go

@@ -335,7 +335,7 @@ func (b *blockWriter) send() error {
 	}
 	// Add block id
 	hdr := msgp.AppendInt8(b.hdr[:0], int8(b.id))
-	if b.buf.Len() > math.MaxUint32 {
+	if uint32(b.buf.Len()) > math.MaxUint32 {
 		return errors.New("max block size exceeded")
 	}
 	// Add block length.