Alias iso8859_1 to latin_1 which is the same encoding, but has
a much faster codec implementation.
diff --git a/Lib/encodings/aliases.py b/Lib/encodings/aliases.py
index 7362e78..681f9e3 100644
--- a/Lib/encodings/aliases.py
+++ b/Lib/encodings/aliases.py
@@ -393,11 +393,18 @@
'cskoi8r' : 'koi8_r',
# latin_1 codec
+ #
+ # Note that the latin_1 codec is implemented internally in C and a
+ # lot faster than the charmap codec iso8859_1 which uses the same
+ # encoding. This is why we discourage the use of the iso8859_1
+ # codec and alias it to latin_1 instead.
+ #
'8859' : 'latin_1',
'cp819' : 'latin_1',
'csisolatin1' : 'latin_1',
'ibm819' : 'latin_1',
'iso8859' : 'latin_1',
+ 'iso8859_1' : 'latin_1',
'iso_8859_1' : 'latin_1',
'iso_8859_1_1987' : 'latin_1',
'iso_ir_100' : 'latin_1',