Binary headers are no longer used by default

src/CHANGELOG

@@ -120,6 +120,9 @@ ECL 0.9f
    --with-system-{gmp,boehm} now take an optional argument which can be "auto",
    for automatic detection of the libraries (M. Pasternacki).
 
+ - By default, the size of binary streams is rounded to a multiple of 8. If you
+   want other behavior, pass :USE-HEADER-P T to the function OPEN.
+
 * ANSI Compatibility:
 
  - DEFSETF forms are enclosed in a block with the name of the accessor.

src/c/file.d

@@ -2539,7 +2539,7 @@ normalize_stream_element_type(cl_object element_type)
 		   (if_exists Cnil iesp)
 		   (if_does_not_exist Cnil idnesp)
 	           (external_format @':default')
-		   (use_header_p Ct)
+		   (use_header_p Cnil)
 	      &aux strm)
 	enum ecl_smmode smm;
 	bool char_stream_p;