Dollar in identifiers

    I'm  not sure if it's according to or violating the standard.
    But most other databases allow a '$' inside  of  identifiers.
    Well,  most  of  them recommend not to use it, but hey guy's,
    what's a recommendation for a programmer?

    In order to lower porting issues, I think it'd be nice to add
    that  to  PostgreSQL  as  well.  It's  two more characters in
    scan.l and doesn't break the regression test.

    Objections?


Jan

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