email.utils.decode_params not supporting params that contain hyphens

Bug report

Bug description:

The decode_params function from email.utils is failing to combine the parameters from multiple lines if the name of the parameter includes a hyphen "-". Maybe it's this regex which is too strict: https://github.com/python/cpython/blob/9d1e668e6f40967dda5cbb1ce298bf0dff2d807c/Lib/email/utils.py#L392-L393

The decode_params function always ignores the first 2-tuple but the first parameter in a SMTP header can already be a multiline parameter. I don't see a reason why the first array element is skipped here:
https://github.com/python/cpython/blob/9d1e668e6f40967dda5cbb1ce298bf0dff2d807c/Lib/email/utils.py#L398-L405

my code to reproduce:

from email.utils import decode_params

decode_params([('parameter-name*0*',"utf-8''start;"),("parameter-name*1*","-middle-;"),("parameter-name*2*","end;")])
# parameter-name is not combined:
#  [('parameter-name*0*', "utf-8''start;"), ('parameter-name*1*', '"-middle-;"'), ('parameter-name*2*', '"end;"')]

decode_params([('parametername*0*',"utf-8''start;"),("parametername*1*","-middle-;"),("parametername*2*","end;")])
# parametername is combined but not the first 2-tuple:
# [('parametername*0*', "utf-8''start;"), ('parametername', (None, None, '"-middle-;end;"'))]

decode_params([("ignored","ignored"),('parametername*0*',"utf-8''start;"),("parametername*1*","-middle-;"),("parametername*2*","end;")])
# parametername is now combined as expected, the additional entry can be ignored when processing the output
# [('ignored', 'ignored'), ('parametername', ('utf-8', '', '"start;-middle-;end;"'))]

Thank you
Michael

CPython versions tested on:

3.12

Operating systems tested on:

Linux

Linked PRs

• gh-153536

Empieza en Lib/email/utils.py, en decode_params, e inspecciona el análisis de nombres de parámetros alrededor de la expresión regular mencionada y del tratamiento de la tupla inicial. Reproduce los tres ejemplos del issue y después compara el comportamiento con el PR enlazado gh-153536. La tarea estará terminada cuando los nombres de parámetros con guiones y un primer parámetro multilínea se gestionen de forma coherente sin introducir regresiones en los casos existentes.