Implementation

Author: vstinner

peps/pep-0782.rst

@@ -277,6 +277,11 @@ The implementation allocates internally a :class:`bytes` object, so
 :c:func:`PyBytesWriter_Finish` just returns the object without having
 to copy memory.
 
+For strings up to 256 bytes, a small internal raw buffer of bytes is
+used. It avoids having to resize a :class:`bytes` object which is
+inefficient. At the end, :c:func:`PyBytesWriter_Finish` creates the
+:class:`bytes` object from this small buffer.
+
 
 Backwards Compatibility
 =======================