ext/numo/binrw/write.c in numo-binrw-0.1.1 vs ext/numo/binrw/write.c in numo-binrw-0.2.1

@@ -25,9 +25,10 @@
 }
 
 
 VALUE nrw_bin_write(VALUE self, VALUE obj, VALUE filename){
     char* cfilename;
+    obj = rb_funcall(obj, rb_intern("copy"), 0);
     void* data = na_get_pointer(obj);
     long size = NUM2LONG(rb_funcall(obj, rb_intern("size"), 0));
 
     if(rb_is_a(filename, rb_cArray)){
         long row = NUM2LONG(rb_funcall(filename, rb_intern("size"), 0));
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