Add a safe API for creating ASCII-only strings

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index c422e172d2dd15dc51854faad7798bb216f2b623..5e2e879ec09c7af4141c9e38afcdf836ed3264a0 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -1262,6 +1262,13 @@ class String : public Primitive {
    */
   V8EXPORT static Local<String> New(const char* data, int length = -1);
 
+  /**
+   * Allocates a new string from ASCII data.
+   * Any non-ASCII characters will have the high bit stripped.
+   * The second parameter 'length' gives the buffer length.
+   */
+  V8EXPORT static Local<String> NewFromAscii(const char* data, int length = -1);
+
   /** Allocates a new string from 16-bit character codes.*/
   V8EXPORT static Local<String> New(const uint16_t* data, int length = -1);