How to properly handle synonyms in \getparameters?

[Mojca Miklavec <mojca.miklavec.lists@gmail.com>]

Dear gurus,

This question concerns both MKII and MKIV (I need the functionality in
both, even though I will try to rewrite the MKIV part as soon as I
have time).

I have a command:
    \mycommand[a][newparam=value]
with more or less the following definition:
    \def\mycommand[#1][#2]{%
        \getparameters[@@mycommand@#1@][#2]
        % ... some extra code ...
    }

However I used to use
    \mycommand[a][oldparam=value]
and now I would like to switch the syntax to
    \mycommand[a][newparam=value]
but I would like the oldparam to keep working normally.

I will read the value with \@@mycommand@a@newparam.

My question: what is the most elegant value to do that?

I can imagine something like
    \def\mycommand[#1][#2]{%
        \undefinecommand\@@mycommand@a@oldparam % pseudocode
        \getparameters[@@mycommand@#1@][#2]
        \doifdefined{\@@mycommand@a@oldparam}
            \let\@@mycommand@a@newparam\@@mycommand@a@oldparam
        % ... some extra code ...
    }

but there is most probably some more elegant solution to that?

Thank you,
    Mojca
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