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A sign, a space or an alternate form parsed fine on a string spec and
then had no effect:
>>> format('ab', '+')
'ab'
>>> f"{'ab':#5}"
'ab '
CPython raises ValueError for all three. format_string already refused z
and an explicit '=' alignment with the same family of messages, so the
three checks go next to those, in the order CPython reports them: sign,
then z, then the alternate form, then the alignment.
Assisted-by: Claude Code:claude-opus-5