This is a Python implementation of the WHATWG Encoding standard.
In order to be compatible with legacy web content when interpreting
something like Content-Type: text/html; charset=latin1, tools need
to use a particular set of aliases for encoding labels as well as
some overriding rules. For example, US-ASCII and iso-8859-1 on the
web are actually aliases for windows-1252, and an UTF-8 or UTF-16
BOM takes precedence over any other encoding declaration. The
Encoding standard defines all such details so that implementations
do not have to reverse-engineer each other.
This module has encoding labels and BOM detection, but the actual
implementation for encoders and decoders is Python's.
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