Drop implicit FAST_READY calls.

pep-0393.txt

@@ -138,7 +138,9 @@ is finalized.
 PyUnicode_Ready() converts a string containing only a wstr
 representation into the canonical representation. Unless wstr and str
 can share the memory, the wstr representation is discarded after the
-conversion.
+conversion. PyUnicode_FAST_READY() is a wrapper that avoids the 
+function call if the string is already ready. Both APIs return 0
+on success and -1 on failure.
 
 String Access
 -------------
@@ -147,16 +149,17 @@ The canonical representation can be accessed using two macros
 PyUnicode_Kind and PyUnicode_Data. PyUnicode_Kind gives one of the
 values PyUnicode_WCHAR_KIND (0), PyUnicode_1BYTE_KIND (1),
 PyUnicode_2BYTE_KIND (2), or PyUnicode_4BYTE_KIND (3). PyUnicode_DATA
-gives the void pointer to the data. All these functions call
-PyUnicode_Ready in case the canonical representation hasn't been
-computed yet. Access to individual characters should use
-PyUnicode_{READ|WRITE}[_CHAR]:
+gives the void pointer to the data. Access to individual characters
+should use PyUnicode_{READ|WRITE}[_CHAR]:
  
  - PyUnciode_READ(kind, data, index)
  - PyUnicode_WRITE(kind, data, index, value)
  - PyUnicode_READ_CHAR(unicode, index)
  - PyUnicode_WRITE_CHAR(unicode, index, value)
 
+All these macros assume that the string is in canonical form;
+callers need to ensure this by calling PyUnicode_FAST_READY.
+
 A new function PyUnicode_AsUTF8 is provided to access the UTF-8
 representation. It is thus identical to the existing
 _PyUnicode_AsString, which is removed. The function will compute the