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Require metadata to be serialised using UTF-8 #1046

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3 changes: 3 additions & 0 deletions source/specifications/core-metadata.rst
Expand Up @@ -22,6 +22,9 @@ definition, the practical standard is set by what the standard library
:mod:`python:email.parser` module can parse using the
:data:`~.python:email.policy.compat32` policy.

Whenever metadata is serialised to a byte stream (for example, to save
to a file), strings must be serialised using the UTF-8 encoding.

Although :pep:`566` defined a way to transform metadata into a JSON-compatible
dictionary, this is not yet used as a standard interchange format. The need for
tools to work with years worth of existing packages makes it difficult to shift
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