diff --git a/blob.go b/blob.go
index bb10c5f..6e4f7d9 100644
--- a/blob.go
+++ b/blob.go
@@ -143,6 +143,7 @@ func (b *Blob) WriteTo(w io.Writer) (n int64, err error) {
 			return n, err
 		}
 		if int64(m) != want {
+			// notest // Write misbehaving
 			return n, io.ErrShortWrite
 		}
 
diff --git a/context.go b/context.go
index a18211d..6c254d1 100644
--- a/context.go
+++ b/context.go
@@ -176,7 +176,7 @@ func (ctx Context) ResultJSON(value any) {
 	data, err := json.Marshal(value)
 	if err != nil {
 		ctx.ResultError(err)
-		return
+		return // notest
 	}
 	ctx.ResultRawText(data)
 }
diff --git a/ext/blobio/blob.go b/ext/blobio/blob.go
index 7649ff0..97d3943 100644
--- a/ext/blobio/blob.go
+++ b/ext/blobio/blob.go
@@ -81,7 +81,11 @@ func writeblob(ctx sqlite3.Context, arg ...sqlite3.Value) {
 		return // notest
 	}
 
-	_, err = blob.Write(arg[5].RawBlob())
+	if p, ok := arg[5].Pointer().(io.Reader); ok {
+		_, err = blob.ReadFrom(p)
+	} else {
+		_, err = blob.Write(arg[5].RawBlob())
+	}
 	if err != nil {
 		ctx.ResultError(err)
 		return // notest
diff --git a/ext/blobio/blob_test.go b/ext/blobio/blob_test.go
index f20ff42..52cdd68 100644
--- a/ext/blobio/blob_test.go
+++ b/ext/blobio/blob_test.go
@@ -5,6 +5,7 @@ import (
 	"log"
 	"os"
 	"reflect"
+	"strings"
 	"testing"
 
 	"github.com/ncruces/go-sqlite3"
@@ -47,7 +48,7 @@ func Example() {
 	// Read the BLOB.
 	_, err = db.Exec(`SELECT openblob('main', 'test', 'col', rowid, false, ?) FROM test`,
 		sqlite3.Pointer[blobio.OpenCallback](func(blob *sqlite3.Blob, _ ...sqlite3.Value) error {
-			_, err = io.Copy(os.Stdout, blob)
+			_, err = blob.WriteTo(os.Stdout)
 			return err
 		}))
 	if err != nil {
@@ -181,7 +182,6 @@ func Test_writeblob(t *testing.T) {
 	err = db.Exec(`
 		CREATE TABLE test (col);
 		INSERT INTO test VALUES (x'cafe');
-		-- INSERT INTO test2 VALUES (x'babe');
 	`)
 	if err != nil {
 		t.Fatal(err)
@@ -194,7 +194,18 @@ func Test_writeblob(t *testing.T) {
 		t.Log(err)
 	}
 
-	err = db.Exec(`SELECT writeblob('main', 'test', 'col', 1, 0, x'babe')`)
+	stmt, _, err := db.Prepare(`SELECT writeblob('main', 'test', 'col', 1, 0, ?)`)
+	if err != nil {
+		t.Log(err)
+	}
+	defer stmt.Close()
+
+	err = stmt.BindPointer(1, strings.NewReader("\xba\xbe"))
+	if err != nil {
+		t.Log(err)
+	}
+
+	err = stmt.Exec()
 	if err != nil {
 		t.Log(err)
 	}
diff --git a/ext/fileio/write.go b/ext/fileio/write.go
index af7d966..e12fe4d 100644
--- a/ext/fileio/write.go
+++ b/ext/fileio/write.go
@@ -29,7 +29,7 @@ func writefile(ctx sqlite3.Context, arg ...sqlite3.Value) {
 	n, err := createFileAndDir(file, mode, arg[1])
 	if err != nil {
 		if len(arg) > 2 {
-			ctx.ResultError(fmt.Errorf("writefile: %w", err))
+			ctx.ResultError(fmt.Errorf("writefile: %w", err)) // notest
 		}
 		return
 	}
diff --git a/txn.go b/txn.go
index 6fe288e..7121778 100644
--- a/txn.go
+++ b/txn.go
@@ -230,7 +230,7 @@ func (c *Conn) txnExecInterrupted(sql string) error {
 	return err
 }
 
-// TxnState starts a deferred transaction.
+// TxnState determines the transaction state of a database.
 //
 // https://sqlite.org/c3ref/txn_state.html
 func (c *Conn) TxnState(schema string) TxnState {